Medically reviewed by Jurairat J. Molina, MD A circular rash is commonly caused by a fungal infection called ringworm.

Tinea corporis. Tinea is one of the most common fungal infections and usually involves the trunk and extremities. Dermatophytes are the cause of tinea and the lesions usually present as circular ...

Clotrimazole (Lotrimin) is a topical treatment used for tinea corporis (ringworm; fungal skin infection that causes a red scaly rash on different parts of the body), tinea cruris (jock itch; fungal ...