Shoulder peeling is considered in the following cases: 1. A large amount of peeling can occur during the recovery period of sunburn, and the original acute phase of redness and bright red color of the rash gradually turns into darker color and flaking, which is caused by excessive exfoliation of the keratin layer due to the recovery of the skin and cell edema to its original state. 2. Consider common psoriasis, which can appear as silvery white peeling on the surface of the erythematous plaques or patches, and is caused by the keratin layer, hyperkeratosis, hyperkeratosis or dyskeratosis. hyperplasia, hyperkeratosis or dyskeratosis, etc. It is caused by polygenic dominant inheritance.