Onychomycosis (Nail Fungus) Treatment in Delhi, India

Nail fungus, or onychomycosis, is a fungal infection of the nails, commonly affecting the toenails but sometimes the fingernails as well. It occurs when fungi, such as dermatophytes, yeasts, or moulds, enter the nail through tiny cracks or cuts, leading to infection.

This condition can cause thickening, discolouration (yellow, white, or brown), brittleness, and crumbling of the nail edges, sometimes accompanied by discomfort or pain. While it may seem like a cosmetic concern, onychomycosis can worsen over time and may spread to other nails or surrounding skin if not treated promptly. Early diagnosis and treatment is, therefore, important to prevent complications and restore the health and appearance of the nails.

Onychomycosis (nail fungus) is classified based on the pattern of fungal invasion into the nail unit. This classification helps dermatologists determine the most effective treatment approach. Here are the main types:

Distal Subungual Onychomycosis (DSO)

This is the most common type of nail fungus, starting at the far end of the nail (distal) and/or the sides (lateral) and spreading inward, underneath the nail plate. It typically presents as yellowish-brown discoloration, thickening of the nail, and accumulation of debris (hyperkeratosis) under the nail. The nail may also lift off the nail bed (onycholysis). This type is primarily caused by dermatophytes, especially Trichophyton rubrum, which also causes athlete's foot, and is very common in toenails.

White Superficial Onychomycosis (WSO)

This type affects only the surface of the nail plate, appearing as distinct white, chalky patches or spots. The affected area can feel soft and crumbly and can often be scraped away easily. It is often caused by Trichophyton mentagrophytes (a dermatophyte) or sometimes non-dermatophytic molds. Less common than DSO, it is often easier to treat with topical medications because the fungus is on the surface.

Proximal Subungual Onychomycosis (PSO)

This is the least common type in healthy individuals. The infection starts at the base of the nail, near the cuticle (proximal nail fold), and spreads outward as the nail grows. White spots or discoloration appear at the base of the nail, moving distally, and the nail may also thicken. While Trichophyton rubrum can be a cause, this type is notably more common in individuals with compromised immune systems, particularly those with HIV/AIDS, and is often considered an early indicator of immunosuppression.

Endonyx Onychomycosis

In this type, the fungus invades the nail plate itself but does not involve the nail bed or cause significant thickening or separation (onycholysis). The nail appears milky white or yellowish, with internal discoloration and sometimes lamellar (layered) splitting within the nail plate. There is a lack of subungual hyperkeratosis (debris under the nail). This type is often caused by specific dermatophytes like Trichophyton soudanense.

Candidal Onychomycosis

This type is caused by yeast, primarily Candida species (like Candida albicans). It is more common in fingernails, especially in people whose hands are frequently wet (e.g., healthcare workers, dishwashers). It is often associated with inflammation and swelling of the skin around the nail (paronychia). The nail itself may become discolored (white, yellow, green, or black) and may eventually lift off the nail bed.

Total Dystrophic Onychomycosis

This is the most severe and advanced form of any of the other types, where the entire nail plate is infected and destroyed. The nail becomes completely thick, brittle, crumbling, discolored, and often separates from the nail bed. It represents the end stage of a long-standing or untreated fungal infection.

While anyone can develop nail fungus, certain factors can increase one’s risk of developing onychomycosis:

• Ageing: Older adults are more prone due to reduced blood circulation and slower nail growth.
• Warm, Humid Environments: Wearing closed shoes for long periods or living in humid climates can increase risk.
• Walking Barefoot in Public Areas: Such as swimming pools, locker rooms, and communal showers.
• Nail Injuries: Trauma to the nail or surrounding skin can allow fungi to enter more easily.
• Excessive Sweating: Creates a moist environment that encourages fungal growth.
• Medical Conditions: Conditions like diabetes, peripheral vascular disease, or weakened immune systems increase susceptibility.
• History of Athlete’s Foot: This fungal infection can spread from the skin to the nails.
• Poor Nail Hygiene: Not keeping nails clean and trimmed may contribute to fungal infections.

By being aware of these risk factors, one can take preventive steps to reduce the likelihood of developing nail fungus and maintain healthier nails.

Onychomycosis, or nail fungus, manifests through a range of visible changes in the affected nail. These symptoms often develop gradually over time and can vary in severity. Recognising these signs early is crucial for timely diagnosis and effective treatment.

Here are the primary symptoms of onychomycosis:

• Discoloration: One of the most common and noticeable symptoms is a change in nail colour. The affected nail may turn white, yellow, brown, or even black. The discoloration can appear as patches, streaks, or affect the entire nail. It often gives the nail a dull, opaque, or cloudy appearance.
• Thickening: The nail plate frequently becomes significantly thicker and more rigid than a healthy nail. This thickening can make the nail difficult to trim with regular clippers and may even cause discomfort when wearing shoes due to pressure.
• Brittleness and Crumbling: Infected nails often become brittle, fragile, and prone to crumbling. Pieces of the nail may break off easily, and the surface can appear ragged or rough. Debris, which is essentially the accumulation of fungal elements and dead nail tissue, can collect under the nail.
• Distorted Shape or Deformity: As the infection progresses, the nail can become misshapen or distorted. It might grow abnormally, become elevated, or develop ridges.
• Separation from the Nail Bed (Onycholysis): The nail may begin to lift or detach from the underlying nail bed, creating a gap. This space can become a breeding ground for more fungi and bacteria, and debris often accumulates there.
• Foul Odor: In some cases, particularly if bacteria also invade the space under the nail, a slightly unpleasant or foul smell may emanate from the infected nail.
• Pain or Discomfort: While often painless in its early stages, severe or long-standing onychomycosis can lead to pain, tenderness, or discomfort. This is especially true if the thickened nail presses against footwear or if the infection leads to inflammation of the surrounding skin.
• Loss of Luster: Healthy nails typically have a smooth, somewhat shiny surface. Fungal nails often lose this natural sheen, appearing dull and opaque.

It is important to note that some of these symptoms can also be indicative of other nail conditions, such as psoriasis of the nails, trauma, or bacterial infections. Therefore, if these symptoms are observed, a proper diagnosis by a dermatologist is essential to confirm onychomycosis and initiate appropriate treatment.

While the signs of onychomycosis often appear obvious, other conditions can mimic the symptoms, making accurate diagnosis crucial before committing to a lengthy treatment plan. At Max Hospitals, our dermatologists use a combination of clinical evaluation and specialised tests to confirm the presence of fungus and identify the exact type responsible.

Initial Consultation

The journey begins with a detailed assessment by a specialist, typically a dermatologist or podiatrist.

• Medical History Review: The clinician asks about when the symptoms first appeared, how the condition progressed, and whether the individual has any underlying health conditions, such as diabetes or circulatory issues, which can influence both the infection and the choice of treatment. They also inquire about any previous treatments undergone.
• Visual Examination: The specialist thoroughly examines the affected nail or nails, noting the colour, thickness, and any separation from the nail bed. The surrounding skin is also checked for signs of Athlete's foot (tinea pedis), which often accompanies nail fungus.

Confirming the Fungal Infection

Visual inspection alone is usually not enough to confirm a fungal infection, nor can it identify the specific type of fungus (dermatophyte, yeast, or non-dermatophyte mould). That’s why laboratory testing is essential for an accurate diagnosis and for choosing the right treatment.

Specimen Collection

To confirm the presence of fungus, a small sample will be collected from the affected area. This is usually painless and involves:

• Scraping: The clinician uses a sterile instrument to gently scrape material from beneath the edge of the infected nail, where the fungus is most active.
• Clipping: A small piece of the damaged or thickened nail plate may also be clipped off.

Laboratory Testing

The collected specimens are sent to a laboratory for analysis, which may involve several techniques:

• Potassium Hydroxide (KOH) Test: This is the most rapid test. The sample is mixed with a potassium hydroxide solution to dissolve the skin cells and nail material, leaving only the fungus visible under a microscope. This quickly confirms the presence of a fungal organism.
• Fungal Culture: The sample is placed in a special medium that encourages fungal growth. This takes longer (often several weeks) but is crucial as it identifies the specific species of fungus causing the infection. Knowing the specific species allows the doctor to select the most effective antifungal medicine.
• Polymerase Chain Reaction (PCR) Test: While not always necessary, this molecular test can be used for rapid identification, especially in complex or culture-negative cases. It detects the genetic material of the fungus, providing quick and precise results.

Treatment for onychomycosis depends on several factors, including the type of fungus responsible, the extent of nail involvement, and whether the infection is persistent or recurrent. At Max Hospitals, a personalised treatment plan is developed that suits the patient’s condition and lifestyle.

Medication

For many cases, antifungal medications form the primary treatment approach. Options include:

Oral antifungal drugs

These medications are often the first choice when the infection affects multiple nails, involves thickened nails, or has persisted for a long time. They work by helping a new healthy nail grow in place of the infected one. Treatment may require several weeks of therapy, followed by months of nail growth for full effect.

Topical antifungal treatments

These include medicated nail polishes and creams applied directly to the nail and surrounding skin. They are typically used when the infection is mild or limited to a few nails. Often, the nail surface is thinned or filed first to allow better penetration of the medication.

Procedural Intervention

When standard medications are less effective or when thickened nails limit topical treatment penetration, additional procedures may be used:

Nail debridement or thinning

In this procedure, a clinician files or trims the nail plate to remove damaged material, reduce pressure or discomfort, and enhance medication delivery.

Partial or complete nail removal

For severe or deeply entrenched infections, removal of the nail may be considered so that antifungal treatments can reach underlying tissue more effectively.

Observation and Lifestyle Support

In mild cases, or where patients prefer minimal intervention, a “monitor‐and‐support” approach may be adopted. This includes:

• Regular checking of the nails
• Ensuring proper foot or hand hygiene
• Avoiding conditions that encourage fungal growth (e.g., moist, warm environments)
• Continuous use of antifungal sprays or powders where appropriate

Even after successful treatment, there is a risk of reinfection. That’s why, at Max Hospitals, patients are advised to ensure routine follow-up appointments to monitor for recurrence, spread to nearby nails or skin, and variations in treatment response, particularly in individuals with additional medical conditions.

While not all cases of onychomycosis can be prevented, certain measures can significantly reduce the risk of developing a fungal nail infection or experiencing a recurrence after treatment. At Max Hospitals, preventive care is considered an important part of long-term nail health.

Maintain Good Nail Hygiene

Keeping the nails clean and dry helps limit fungal growth. Regular washing and thorough drying of hands and feet, especially after exposure to moisture, reduces the likelihood of fungal overgrowth.

Choose Breathable Footwear

Footwear made from breathable materials, such as mesh or leather, reduces moisture build-up around the toes. Moist, warm environments encourage fungal growth, so selecting shoes and socks that allow ventilation can help protect nail health.

Trim Nails Regularly

Keeping nails short and cutting them straight across reduces the risk of trauma and prevents debris from collecting beneath the nail, lowering the chances of fungal infection.

Practise Safe Nail Care

Using clean and properly sanitised nail tools is essential. Shared nail clippers, files, and salon tools can transfer fungal spores from one person to another. It is advisable to ensure appropriate hygiene practices during nail grooming.

Avoid Walking Barefoot in Damp Public Areas

Public showers, swimming pool decks, and locker rooms can harbour fungal organisms. Wearing footwear such as flip-flops or sandals in these environments helps reduce exposure.

Manage Excessive Sweating

Excessive perspiration around the feet creates an environment where fungi can thrive. Using antifungal powders or moisture-wicking socks can help maintain a dry environment around the nails.

Protect Nails from Injury

Nail trauma creates openings where fungi can enter. Wearing properly fitting shoes and avoiding repetitive pressure on toenails can minimise the risk of injury and subsequent infection.

While many cases of onychomycosis begin as mild infections, complications can arise when the condition is left untreated or when the infection becomes persistent. These complications may affect comfort, nail function, and, in some cases, overall health. At Max Hospitals, the clinical team focuses on early diagnosis and timely treatment to minimise the risk of these issues.

Nail Thickening and Distortion

Long-standing fungal infections can cause the nail to become significantly thickened, brittle, or misshapen. This may lead to discomfort while walking or wearing closed footwear and can interfere with daily activities.

Spread of Infection

The fungus can extend to neighbouring nails or surrounding skin, leading to athlete’s foot (tinea pedis), skin irritation, or secondary bacterial infections. Spread is more common when hygiene measures are not maintained or when the infection remains untreated for an extended period.

Pain and Discomfort

Thickened, raised, or distorted nails can cause pressure-related discomfort. In severe cases, the nail may dig into surrounding skin, resulting in pain, inflammation, or swelling.

Nail Separation (Onycholysis)

In some cases, the infected nail may gradually detach from the nail bed. This separation increases the risk of additional infections and can make the nail more difficult to treat.

Recurrent Infections

Even after successful treatment, fungal spores can remain in shoes, socks, or the surrounding environment, leading to reinfection. Individuals with chronic conditions such as diabetes or vascular disease are more likely to experience repeated episodes.

Secondary Bacterial Infection

A disrupted nail barrier can allow bacteria to enter the surrounding tissue, causing redness, warmth, tenderness, or swelling. This is particularly concerning in individuals with diabetes or reduced immunity, where even minor infections can progress more rapidly.

Impact on Comfort and Mobility

Severe nail changes may cause difficulty while standing, exercising, or using certain types of footwear. This can affect routine mobility and reduce overall comfort.

Cosmetic Concerns and Emotional Impact

Discoloured or damaged nails can affect confidence and cause distress, especially when the infection involves multiple fingernails or toenails.

Is onychomycosis contagious?

Yes. Onychomycosis can spread from one nail to another and, in some cases, to other individuals. Fungal organisms thrive in warm, moist environments such as locker rooms, swimming pool areas, and shared footwear. Good hygiene and preventive measures help reduce the risk of transmission.

What is the most effective treatment for onychomycosis?

The most effective treatment depends on the type and severity of the infection. In many cases, oral antifungal medications achieve the highest cure rates, especially for long-standing or extensive infections. Similarly, combination therapy, using both oral and topical treatments, may be recommended for resistant or recurrent cases.

Can onychomycosis go away on its own?

Onychomycosis rarely resolves without treatment. The infection often persists and may worsen gradually, leading to nail thickening, discoloration, and discomfort. Because nails grow slowly, early treatment is important to prevent progression.

How long does it take to cure onychomycosis?

Treatment duration varies by severity, type of fungus, and the specific therapy used. Antifungal medications may be required for several weeks, but visible improvement takes longer because new nail growth is slow. Complete nail regrowth may take:

• 6–12 months for toenails
• 4–6 months for fingernails

When should treatment for onychomycosis begin?

Treatment is recommended as soon as onychomycosis is confirmed. Early management prevents the infection from spreading to additional nails or surrounding skin and reduces the risk of complications such as pain, nail deformity, or secondary infections.

How safe are oral antifungal medications?

Oral antifungal medicines are generally safe when prescribed after appropriate evaluation. Before starting therapy, clinicians often review liver function and medical history, particularly in individuals with chronic conditions. Regular monitoring may be advised during treatment to ensure safety.

What are the side effects of onychomycosis medications?

Side effects vary depending on the type of treatment:

• Oral antifungals: Possible side effects include headache, gastrointestinal discomfort, skin rash, or temporary changes in liver enzymes.
• Topical treatments: Generally well tolerated; may cause mild redness or irritation around the nail.

Clinicians assess suitability before recommending any medication.

Can laser therapy cure onychomycosis?

Laser therapy may help reduce fungal activity and can be used as a supportive treatment, but it is usually not considered as a standalone cure. It is typically used alongside topical or oral antifungals to improve treatment outcomes.

Is surgery necessary for treating fungal nail infections?

Surgical procedures are not the first line of treatment. Partial or complete nail removal may be considered only in severe, extensive, or resistant infections where standard treatments have not been effective. It is performed to allow better access for topical medications and to reduce discomfort.

Can I wear nail polish during treatment?

Nail polish is usually discouraged during treatment because it can trap moisture, interfere with medication absorption, and create an environment that supports fungal growth. Medicated nail lacquers, however, are specifically designed for treatment and may be suitable when recommended.

Reviewed by Dr. Kashish Kalra, Head of Dept and Consultant, Dermatology, on 18 February 2026.