The scales are very thick, and the hair at the lesion and the thick scales dry and tighten into a bundle, like the head of a hairbrush, sometimes the damage can extend to the front hairline and invade the forehead for several centimeters, in the acute progressive stage, when the whole body lesion is serious, the face can also appear lesions, mostly in the form of droplets or nail-sized red papules.　　If the lesions occur on the palms of the hands and feet, there are often obvious keratotic patches with a thick center and thin edges, and the patches may have white scales or punctate depressions, sometimes causing striped skin fissures due to thick lesions.