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Tinea cruris also known as jock itch is a pretty common fungal infection of the groin and upper thighs. Tinea cruris like other tinea infections is caused by several types of mold-like fungi called dermatophytes. All of us have microscopic fungi and bacteria living on our bodies, and dermatophytes are among them. Dermatophytes live on the dead tissues of your skin, hair, and nails and thrive in warm, moist areas like the insides of the thighs. So, when the groin area gets sweaty and isn't dried properly, it provides a perfect environment for the fungi to multiply and thrive.
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