Fungal Skin Infections:
Types, Symptoms, and Treatment

Ringworm, athlete's foot, jock itch, and other fungal skin infections. Learn symptoms, causes, and treatment options.

Types of Fungal Skin Infections

Fungal skin infections are among the most common dermatologic conditions, affecting millions of people each year. They are caused by dermatophytes, yeasts, or molds that thrive in warm, moist environments and feed on keratin, the protein found in skin, hair, and nails. While usually not life-threatening, these infections can be persistent, uncomfortable, and cosmetically bothersome if left untreated.

The most common types of fungal skin infections include:

• Tinea corporis (ringworm): A circular, red, scaly rash that can appear on the trunk, arms, or legs.
• Tinea pedis (athlete's foot): An itchy, peeling, and sometimes blistering infection of the feet, particularly between the toes.
• Tinea cruris (jock itch): A red, itchy rash in the groin and inner thigh folds.
• Tinea capitis: A fungal infection of the scalp, most common in children, which can cause hair loss and scaly patches.
• Tinea versicolor (pityriasis versicolor): Caused by a yeast, this produces discolored patches on the chest, back, and shoulders that may be lighter or darker than surrounding skin.
• Onychomycosis: Fungal infection of the nails, causing thickened, discolored, and brittle nails.
• Candidiasis: A yeast infection caused by Candida species that affects moist skin folds, the mouth, or genital areas.

Ringworm Explained

Despite its name, ringworm has nothing to do with worms. It is a fungal infection caused by dermatophytes, most commonly Trichophyton, Microsporum, and Epidermophyton species. The name comes from the characteristic ring-shaped rash that the infection produces: a circular patch with a raised, red, scaly border and a clearer center that can resemble a worm curled under the skin.

Ringworm is highly contagious and spreads through direct skin-to-skin contact with an infected person or animal, or by touching contaminated objects such as towels, clothing, combs, and gym equipment. It can also be contracted from soil that harbors the fungi. The infection is common in children, athletes, and anyone who frequents communal spaces like locker rooms and swimming pools.

Mild ringworm on the body typically responds to over-the-counter topical antifungal creams containing clotrimazole, miconazole, or terbinafine, applied twice daily for two to four weeks. Ringworm of the scalp (tinea capitis), however, requires oral antifungal medication because topical treatments cannot penetrate the hair follicle sufficiently. If your rash is not improving after two weeks of over-the-counter treatment, a provider can evaluate whether a stronger prescription medication is needed through a fungal skin infection treatment visit.

Athletes Foot

Athlete's foot (tinea pedis) is the most common fungal skin infection in adults. It thrives in the warm, damp environment inside shoes and socks, and is frequently acquired in communal areas such as gym showers, pool decks, and locker rooms. The infection primarily affects the spaces between the toes but can spread to the soles, sides of the feet, and even the toenails.

Symptoms of athlete's foot include:

• Itching, stinging, or burning between the toes, especially after removing shoes and socks
• Peeling, cracking, or flaking skin on the soles or between the toes
• Red, dry, scaly patches on the bottom or sides of the feet (moccasin-type)
• Small blisters that may ooze or crust over (vesicular type)
• Macerated (white, soggy) skin between the toes

Mild cases usually respond well to over-the-counter antifungal creams, sprays, or powders applied daily for two to four weeks. It is important to continue treatment for the full recommended duration even after symptoms improve, as stopping early often leads to recurrence. Keep feet clean and dry, change socks daily, and wear breathable footwear to help the infection clear and prevent reinfection.

Jock Itch

Jock itch (tinea cruris) is a fungal infection that affects the groin, inner thighs, and sometimes the buttocks. It is caused by the same dermatophyte fungi responsible for athlete's foot and ringworm. The infection is more common in men and adolescent boys, and it tends to occur during warm, humid weather or after vigorous physical activity that causes sweating in the groin area.

The hallmark symptom is a red, itchy rash with a well-defined, raised, scaly border that may extend in a semicircular pattern from the groin crease down the inner thigh. The center of the rash may appear relatively clear as it spreads outward. The rash can be quite uncomfortable, with persistent itching and a burning sensation that worsens with friction from clothing or movement.

Jock itch frequently co-occurs with athlete's foot, as the same fungi can spread from the feet to the groin via contaminated hands or towels. When treating jock itch, it is important to also check for and treat any athlete's foot to prevent reinfection. Over-the-counter antifungal creams are usually effective for mild cases. Keep the groin area clean and dry, wear loose-fitting cotton underwear, and avoid sharing towels or athletic clothing.

When Over-the-Counter Doesn't Work

Over-the-counter antifungal products are effective for many mild fungal skin infections, but there are situations where they fall short. If you have been using an OTC antifungal cream or spray consistently for two to four weeks and your symptoms have not improved, or if the infection has spread or worsened, it is time to see a provider for further evaluation.

Common reasons OTC treatment may fail include:

• Misdiagnosis: The rash may not actually be fungal. Conditions such as eczema, psoriasis, contact dermatitis, and bacterial infections can mimic fungal infections. Using antifungal cream on a non-fungal rash will not help and may delay appropriate treatment.
• Resistant or deep infection: Some fungal strains are less responsive to OTC antifungals, and infections that involve hair follicles, nails, or deeper skin layers require stronger medication.
• Incomplete treatment: Stopping antifungal therapy too early because symptoms improved allows residual fungi to regrow.
• Reinfection: Ongoing exposure to the source of infection (contaminated shoes, shared towels, untreated athlete's foot) can cause the infection to return.
• Immunocompromised status: Patients with diabetes, HIV, or those taking immunosuppressive medications may need more aggressive treatment.

Prescription Treatment

When over-the-counter antifungals are insufficient, prescription-strength medications can provide the additional potency needed to clear the infection. Your provider will select a treatment based on the type, location, and severity of the infection.

Prescription treatment options include:

• Prescription topical antifungals: Higher-strength creams or ointments such as ketoconazole cream, econazole, or ciclopirox may be prescribed for skin infections that are more extensive or resistant to OTC products.
• Oral antifungal medications: Terbinafine (Lamisil), fluconazole (Diflucan), itraconazole (Sporanox), and griseofulvin are systemic antifungals used for infections that cannot be reached by topical treatments, such as tinea capitis (scalp ringworm) and onychomycosis (nail fungus). Oral terbinafine is the most commonly prescribed for dermatophyte infections.

Oral antifungal medications are generally well tolerated but may require monitoring of liver function with prolonged use. Your provider will discuss potential side effects and any necessary blood work before starting treatment. Treatment duration varies by condition: skin infections may clear in two to six weeks, while toenail fungus often requires three to six months of oral therapy for full resolution.

Preventing Fungal Infections

Fungal infections are often preventable with good hygiene practices and simple lifestyle modifications. Because dermatophytes thrive in warm, moist environments, keeping your skin clean and dry is the most effective preventive strategy.

Practical prevention tips include:

• Keep skin dry: Thoroughly dry your feet (especially between the toes), groin, and skin folds after bathing or swimming. Use a separate towel for your feet if you are prone to athlete's foot.
• Wear breathable fabrics: Choose moisture-wicking socks and underwear, and avoid wearing damp clothing for extended periods.
• Change socks and underwear daily: More frequently if you sweat heavily during exercise.
• Wear shower shoes: Use flip-flops or water shoes in communal showers, locker rooms, and pool areas.
• Do not share personal items: Towels, razors, combs, shoes, and athletic gear can transfer fungi between people.
• Treat athlete's foot promptly: Untreated foot fungus commonly spreads to the groin and nails.
• Rotate shoes: Allow shoes to dry completely between wearings, and consider using antifungal shoe powder or spray.
• Keep nails trimmed: Short, clean nails are less susceptible to fungal invasion.

Getting Treatment Online

Fungal skin infections are ideal for telehealth evaluation. Because these conditions have characteristic visual features, a provider can often make an accurate diagnosis by examining the affected area through high-quality video or by reviewing clear, well-lit photos you submit before the visit. During the consultation, your provider will ask about the duration of your symptoms, prior treatments you have tried, and any underlying health conditions that may affect your treatment plan.

If a fungal infection is confirmed, your provider can prescribe topical or oral antifungal medications directly through the telehealth visit. For cases where the diagnosis is uncertain or the rash does not have a classic fungal appearance, your provider may recommend an in-person visit for a skin scraping and microscopic examination (KOH prep) or fungal culture to confirm the diagnosis before starting treatment.

At InnoCre Telehealth, we offer same-day appointments for patients in Maryland, Washington, and Delaware. Whether you are dealing with a persistent rash, recurring athlete's foot, or a fungal infection that has not responded to OTC treatment, we can help. Schedule a fungal skin infection treatment visit or explore our online rash treatment options to get started.

Frequently Asked Questions