DermatologicalICD-10: B35.6Common, especially in men and athletes

Jock Itch

Also known as: Tinea cruris, Groin fungal infection, Ringworm of the groin

Jock itch (tinea cruris) is a fungal infection of the skin in the groin, inner thighs, and buttocks. Caused by the same dermatophyte fungi as athlete's foot and ringworm, it produces an itchy, red, often ring-shaped rash that thrives in warm, moist areas. It is more common in men and athletes, is mildly contagious, and usually clears with antifungal treatment and keeping the area dry.

Symptoms

Itchy, red rash in the groin, inner thighs, or buttocks
Ring-shaped rash with a raised, scaly border
Burning sensation in the affected area
Flaking, peeling, or cracking skin
Rash that may worsen with exercise or sweating

Causes

  • Dermatophyte fungi (often spread from athlete's foot)
  • Warmth and moisture in the groin area
  • Tight clothing that traps sweat
  • Sharing contaminated towels or clothing

Risk Factors

  • Male sex
  • Sweating heavily or being physically active
  • Obesity (skin folds trap moisture)
  • Having athlete's foot or a weakened immune system
  • Wearing tight or damp clothing

Diagnosis

  • Visual examination of the rash
  • Skin scraping with microscopic (KOH) examination if uncertain
  • Fungal culture in resistant cases

Treatment

  • Over-the-counter topical antifungal creams or powders
  • Keeping the groin clean and dry
  • Wearing loose, breathable cotton underwear
  • Treating any co-existing athlete's foot to prevent reinfection
  • Prescription antifungals for persistent cases

Prevention

  • Keep the groin area clean and dry
  • Change out of sweaty clothing promptly
  • Wear loose-fitting, breathable underwear
  • Treat athlete's foot to stop it spreading to the groin
  • Don't share towels or clothing

When to See a Doctor

  • The rash doesn't improve after two weeks of over-the-counter treatment
  • The rash is severe, spreading, or weeping
  • Signs of bacterial infection appear
  • You have diabetes or a weakened immune system

Frequently Asked Questions

Related Conditions

Athlete's Foot

Dermatological

Ringworm

Infectious

Fungal Nail Infection (Onychomycosis)

Infectious

Vaginal Yeast Infection (Candidiasis)

Reproductive

Eczema

Dermatological

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