Skin acne may be related to acne, folliculitis and eczema. 1. Acne: The cause of acne is related to factors such as androgen levels, increased sebaceous glands, and abnormal keratinization of cells around the hair follicles, etc. It is mainly characterized by the appearance of pimples, pimples, and papules on the skin. 2. Folliculitis: a common cause of Staphylococcus aureus, Malassezia infection, excessive sweating, trauma and other factors may also induce folliculitis. The main manifestation is the appearance of red papules or pustules centered on hair follicles. 3. Eczema: the cause of the disease is not clear, may be related to genetic, immune abnormalities and environmental factors, the patient’s skin will appear erythema, edema and papules. There are many reasons for skin acne, and it is recommended that patients seek medical examination to clarify the cause.