Follicular keratosis is an independent disease, which belongs to acrokeratotic skin heterochromia. Because the damage is moss-like, it is called hair moss. It is a skin disease with keratosis of hair follicle. This may be the dominant inheritance of intestinal chromosomes. Generally, vitamin A can be taken orally without treatment. Acrokeratotic heterodermia is characterized by a pebble-like appearance of acrokeratotic skin, which can extend to the back of the hand, feet and hands. Accompanied by skin heterochromia, especially in exposed parts, blisters and lichenoid keratosis may also occur.