Tinea cruris is most active in men, especially teens and young adults. People who wear tight underwear that trap moisture are especially prone to contracting the rash. Overweight people are susceptible to jock itch because the layers of skin trap moisture and encourage fungus growth. Those who sweat heavily also have an increased tendency to contract the condition. Others who are at high risk of contracting tinea cruris include those with a weakened immune system and people with diabetes.
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