Jinan 106 Psoriasis Hospital told you that scalp psoriasis, that is, psoriasis usually occurs in the head, but it can also involve the trunk and limbs. Generally, you won't let your hair fall out, but it's ugly piece by piece. The pathogenesis of scalp psoriasis is disorder of scalp cell metabolism. The head is a very prone part of psoriasis, which is called scalp psoriasis. This kind of psoriasis can only be found in the scalp, but most of them involve both the trunk and limbs. Scalp psoriasis lesions have clear boundaries and are covered with thick erythema scales. Sometimes they fuse into pieces and even cover the scalp. Due to the mixture of skin and dust, the surface of scales is grayish yellow or grayish yellow. However, after peeling, it is still silvery white, and the hair at the lesion is bundled because of the thick scales, just like bundles of brushes called bundles of hair, but the hair is normal. Scalp psoriasis generally does not make hair fall off, but one by one is very ugly. The pathogenesis of scalp psoriasis is the dysfunction of scalp cells: scalp cells also have a certain metabolic process like skin. After proliferation, the cells in the basal layer gradually mature and push out, and finally become the dead stratum corneum to fall off. If there is something wrong with this process, the maturation process of scalp cells will be incomplete, that is, it will peel off.