Seborrheic dermatitis, also known as seborrheic eczema, is a chronic, superficial inflammatory skin disease characterized by papular and scaly inflammation that occurs in areas of sebum secretion. It can be associated with varying degrees of itching and is commonly seen in adults and newborns. The main symptoms include hair follicle papules appearing in areas of sebum secretion such as the scalp, face, chest, and back, which then merge into dark red or yellow-red patches. These patches are covered with greasy scales and crusts, which can lead to exudation, crusting, and erosion, manifesting eczematous changes. In severe cases, the lesions can spread throughout the body, leading to diffuse erythema and significant desquamation. At this stage, it is referred to as seborrheic erythroderma. This condition is chronic and may have recurrent episodes.