The appearance of brown patches on the body without pain and itching should be considered as caused by a variety of conditions. First of all, we should consider the possibility of seborrheic keratosis, the specific cause of seborrheic keratosis is unknown, it may be related to photoaging, natural aging, viral infection and genetic factors, manifested as brown oily patches on the face and extremities, with smooth or rough surface, usually can choose liquid nitrogen freezing, electric drying method of treatment. Second, also consider the possibility of keloid, keloid is mostly related to keloid and genetic factors, often secondary to skin injury, usually can choose glucocorticoid intra-dermal injection treatment, early can choose X-ray radiation therapy. In addition, the possibility of lichen planus should be considered. Lichen planus may be related to immune factors, genetic factors, viral infections, and drug factors, etc. Topical glucocorticoid creams can usually be chosen.