What Is a Fungal Skin Infection?

Fungal infections of the skin, also known as tinea or dermatophytosis, are common infections caused by fungi that live on the skin, hair, and nails. These infections can affect different parts of the body and are often named based on where they appear.

They are typically not serious but can be uncomfortable and contagious.

What Causes Fungal Skin Infections?

Fungi thrive in warm, moist environments like sweaty skin, locker rooms, and public showers. The most common causes include:

• Dermatophytes – fungi that live on keratin (a protein in skin, hair, and nails)
• Candida – a type of yeast that can also infect moist skin folds

These fungi can spread through:

• Direct skin contact with an infected person or animal
• Contact with contaminated objects like towels, clothing, or gym equipment
• Walking barefoot in damp public areas

What Are the Types of Tinea?

Here are the most common types of fungal skin infections:

Tinea Corporis (Ringworm)

Affects the body. Causes red, circular, scaly rashes that often look like a ring.

Tinea Pedis (Athlete’s Foot)

Affects the feet, especially between the toes. Symptoms include itching, burning, and peeling skin.

Tinea Cruris (Jock Itch)

Affects the groin area. Causes a red, itchy, often ring-shaped rash on inner thighs and buttocks.

Tinea Capitis

Affects the scalp, mostly in children. Leads to scaly patches, hair loss, and sometimes pus-filled bumps.

Tinea Unguium (Onychomycosis)

Affects the toenails or fingernails. Nails may become thick, discolored, brittle, and crumbly.

Tinea Barbae

Affects the beard area in men. Causes red, crusty patches, swelling, and hair loss.

What Are the Symptoms?

Symptoms vary depending on the area affected but can include:

• Red, scaly, or cracked skin
• Itching or burning
• Blisters or oozing in severe cases
• Ring-shaped rashes (especially on the body)
• Thickened, discolored nails (if it affects nails)
• Hair loss in the infected area (scalp or beard)

How Is Tinea Diagnosed?

Doctors can usually diagnose a fungal infection by:

• Looking at the affected area
• Taking a skin scraping for lab testing or viewing under a microscope
• In some cases, using a special light (Wood’s lamp) to examine the skin

How Are Fungal Skin Infections Treated?

Treatment depends on the location and severity:

Mild Infections

• Over-the-counter antifungal creams or powders (clotrimazole, miconazole, terbinafine)
• Keeping the area clean and dry

Moderate to Severe Infections

• Prescription-strength topical treatments
• Oral antifungal medications for nail, scalp, or widespread infections

Treatment duration can range from a few days to several weeks.

Can Fungal Skin Infections Come Back?

Yes. They can recur, especially if the underlying conditions (moisture, heat, poor hygiene) aren’t addressed. Reinfection from shared spaces or items is also common.

How Can You Prevent Fungal Skin Infections?

• Keep your skin clean and dry
• Avoid walking barefoot in public showers or locker rooms
• Change socks and underwear daily
• Don’t share towels, razors, or clothing
• Use antifungal powder if you’re prone to sweating
• Dry feet thoroughly, especially between the toes
• Wash gym clothes and gear after each use

When Should You See a Doctor?

Seek medical attention if:

• The rash doesn’t improve with over-the-counter treatments
• The infection spreads or worsens
• You experience signs of a secondary bacterial infection (pain, swelling, pus)
• The nails or scalp are affected