Tinea corporis

Tinea corporis is a common fungal infection that affects the skin on the body, excluding the scalp, face, hands, feet, and groin. It is caused by a group of fungi called dermatophytes that thrive on the outer layer of the skin. The infection typically causes a red, itchy, and scaly rash that often has a ring-like appearance with a clear center, sometimes called a ringworm. This condition mainly affects the skin barrier and can cause discomfort and cosmetic concerns. It is contagious and can spread through direct skin contact or by sharing contaminated items like towels or clothing. The infection is usually limited to the superficial skin layers and does not affect internal organs.

Tinea corporis is a superficial cutaneous infection caused by dermatophyte fungi, primarily species of Trichophyton, Microsporum, and Epidermophyton. These fungi invade the keratinized layers of the epidermis, leading to an inflammatory response characterized by erythematous, annular plaques with central clearing and peripheral scaling. The infection is transmitted via direct contact with infected humans, animals, or fomites. It is clinically significant due to its high prevalence, potential for spread, and characteristic presentation that aids in diagnosis. The condition is distinct from other dermatophytoses by its localization on the trunk and limbs. It does not typically involve hair follicles or nails, differentiating it from tinea capitis and onychomycosis. The host immune response and fungal virulence factors influence the severity and chronicity of the infection.