Keratosis pilaris, also known as perifollicular keratosis, pore keratosis, follicular keratosis, pore keratosis, chicken skin, etc., is caused by hyperkeratosis of the cells surrounding the hair follicle, as the name implies. This is a genetic skin disease that is commonly seen in adolescents. The incidence of keratosis pilaris is relatively high, about 40% in adults and over 50% in adolescents. Although there is a genetic link between keratosis pilaris and genetic predisposition, it is only in about 30-50% of patients that a significant family history is asked. Most patients have no symptoms and some do not even know they have periorbital keratosis. A few people have mild itching. The rash usually begins to appear before the age of 10, becomes severe after puberty, and slowly improves over time in adulthood, but in many cases it is lifelong. Keratosis pilaris occurs best on the lateral side of the upper arms, but can also appear on the front thighs, buttocks, or cheeks. The lesions are hard, pinpoint to corn-sized papules in line with the pores, with light brown keratinous plugs at the tip that feel like sandpaper to the touch; they contain curly hairs and leave small funnel-shaped depressions after the plugs are removed, but soon new plugs are created in these depressions. Symptoms are often more pronounced in winter and in dry conditions; they improve in summer or in humid conditions. The exact cause of periorbital keratosis is not known, but is currently thought to be the result of abnormal keratinization of epidermal cells near the hair follicle. Excessive accumulation of abnormal keratin can prevent hair from growing properly and become stuck under the skin, resulting in the clinical appearance of a single goose bumps. Sometimes, curly hairs may be found stuck inside these papules. In some cases, the skin may become red and dark and unevenly colored due to finger squeezing or picking, resulting in skin breakdown or pigmentation. Keratosis pilaris is a benign skin condition that is not harmful to the body, except for its aesthetic impact. It often improves with age and generally does not require treatment. If you think that it affects the aesthetics and therefore brings psychological confusion, there are still many ways to improve it, although there is no very effective and thorough treatment. 1, basic care: this one is the most basic and most important. The most important thing for Keratosis Pilaris is skin care and avoiding letting the skin dry out. It is best to use soap and body lotion that does not contain too much alkali to avoid over-cleaning; you can use moisturizing lotion 2-3 times a day, especially after bathing. When using it, gently massage the affected area so that the moisturizing lotion is evenly distributed. In addition, do not pick and scratch. 2, exfoliation: rough pimples can be used with ointment or maintenance products containing fruit acids, lactic acid, salicylic acid, A acid ingredients. Because of the irritating nature of these products, they should be used with special care and under the guidance of a dermatologist. 3, remove hyperpigmentation: you can use with the effect of pigmentation, containing hydroquinone, azelaic acid and other creams. The use of such creams should pay attention to sun protection to avoid aggravation of pigmentation. 4, other therapies: photodynamic therapy, topical immunomodulators, topical vitamin D3, oral A acid, etc., have been tried, but because there is no large-scale study to determine its efficacy, can be used as a treatment alternative. 5, medical aesthetics: For people with severe keratinization and ineffective treatment with topical creams, fruit acid peeling or microdermabrasion is a good choice. In addition, the use of laser hair removal will slow down the symptoms, for patients who have tried various types of treatment does not work, can be considered under the guidance of a doctor.