Acne on the lower body may be related to changes in hormone levels, keratinization of the periphery of the hair, hereditary factors, poor skin care and other reasons. 1. Hormone level changes: when the androgen level in the body increases, it will lead to a large amount of oil secretion, which may induce the disease. 2. Perifollicular keratinization: Keratinization of the cells around the hair follicles will lead to smaller and blocked follicle openings, making it impossible for oil to be eliminated in time, thus forming acne. 3. Genetic factors: the occurrence of acne has a certain heredity, if the parents suffer from acne, the chances of acne in the next generation will increase. 4. Poor skin care: If you use oily bathing products for a long time, or clean with greater force, it may also induce the disease. There are many reasons for acne on the lower body, so it is recommended to go to a regular hospital for a checkup to clarify the cause of the problem.