Tinea capitis and seborrheic dermatitis have fundamentally different causes. Tinea capitis is a fungal infection, including conditions such as yellow tinea, white tinea, black dot tinea, and pustular tinea. It leads to the destruction of hair follicles, which can cause hair loss and even scarring. Seborrheic dermatitis, also known as seborrheic eczema, arises from the excessive secretion of sebum. At this time, it may also be stimulated by the colonization of certain microorganisms, such as Malassezia, causing inflammation. It typically affects the scalp, face, chest, and back. The initial lesions are follicular papules, which gradually enlarge and merge into dark red or yellow-red plaques covered with greasy scales or crusts. It can also exhibit exudation, crusting, erosion, and other eczematous changes, and in severe cases, the skin lesions can become widespread throughout the body. To differentiate between tinea capitis and seborrheic dermatitis, besides the symptoms, local skin flakes can be tested in a laboratory using fungal immunofluorescence, as well as bacterial and fungal cultures.