Follicular keratosis, commonly referred to as acne or poor skin hygiene, is an autosomal disorder that cannot be cured. The disease is less common in early childhood or the disease is not obvious, but the prevalence is high in adolescence, and then gradually decreases with age until it disappears. Etiology: 1, malnourished people (especially vitamin A deficiency); 2, low humidity of the environment; 3, dry air; 4, certain irritants such as tar and grease; 5, a genetic family history, the so-called physical.