Seborrheic dermatitis, also known as seborrheic eczema, is a chronic papular scaly superficial inflammatory skin disease that occurs in areas of excessive sebum secretion. It is commonly found in areas rich in sebaceous glands, such as the head, face, and trunk. The characteristic skin lesions primarily consist of follicular papules that gradually merge into dark red or yellow-red patches, covered with greasy scales or crusts. There may be exudation, crusting, erosion, and eczematous changes. In severe cases, it can spread over the entire body, causing diffuse erythema and significant scaling. The condition may be accompanied by varying degrees of itching.