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Tinea cruris, jock itch, fungal groin infection

What is it?

The inguinal tinea (tinea cruris), mycosis that affects the groin area, is caused by the growth of dermatophytes fungi or Candida albicans in this region. The anatomy of the groin favors the growth of these microorganisms, due to darkness, heat and humidity, characteristics of this area of the body.

In summertime, with the increase of sweating or the use of wet bathing suits for a long time, the local humidity increases, facilitating the appearance this type of mycosis during this time of year.

Tinea cruris is often confused with allergy to underwear or bathing suits. Actualy, the use of synthetic fabrics favors the growth of mycosis by hindering the evaporation of sweat.

Characteristics and symptoms

The disease is manifested by the formation of reddish, scaly or moist lesions, usually accompanied by intense itching. Affects the groin area but may spread to the buttocks, genitals and abdomen.

When the responsible fungus is a dermatophyte, the lesions show well-defined borders, usually scaly, which grow in a centrifuge way (photo below).

When the responsible is the yeast Candida albicans (candidiasis), a moist and reddish lesion is formed, which spreads peripherically by forming small red spots (photo below).


To prevent tinea cruris, one should prefer fresh and loose clothes, especially in the warmer months of the year. Prefer cotton underwear, avoiding synthetic fabric, and avoid staying with wet bathing suits for long time.

The treatment of ringworm can be done with topical or oral antifungal drugs, which will depend on the extent of the disease. Look for a dermatologist at the first symptoms without using any medication, because they can mask the appearance of the disease, hindering the correct diagnosis and the indication of the most appropriate medication for each case.

Related articles

- Skin mycoses
- Intertrigo

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