Seborrheic dermatitis is a diagnosis commonly affecting areas with excess sebum secretion such as the scalp, face, chest, and back. It frequently occurs in young adults and is associated with inflammatory reactions. It requires enhanced cleaning of the scalp and trunk skin, avoiding various irritants, and providing anti-inflammatory treatments and regulation of lipid metabolism. Dietary restrictions typically include avoiding spicy, stimulating, and high-calorie foods, while increasing the intake of green vegetables and coarse fibers. Oral medications such as compound glycyrrhizin tablets, vitamin B6 tablets, niacin tablets, and doxycycline hydrochloride capsules are recommended. For skin lesions, topical application of tacrolimus ointment or pimecrolimus cream, and dibenzoyl hydroxy acid cream are advised, with an emphasis on avoiding the use of steroid medications to prevent difficult-to-control symptoms. (Please follow medical advice when using medication.)