There are many small bumps on the buttocks and they are not itchy. Consider folliculitis, keratosis pilaris, etc., which can be improved by medication. 1. Folliculitis: not paying attention to personal hygiene, often scratching the buttocks, easy to secondary staphylococcus aureus infection, causing folliculitis. You can apply mupirocin ointment, compound polymyxin B ointment and other drugs as prescribed by the doctor. 2. Keratosis pilaris: this is a chronic follicular keratosis pilaris, like chicken skin appearance, the skin is relatively rough, generally do not need treatment. If self-consciousness affects aesthetics, you can apply vitamin A acid ointment, urea ointment and other drugs to improve. Buttocks grow a lot of small bumps also does not itch, should have to go to the hospital to clarify the cause, symptomatic treatment, the above drugs should be used in accordance with medical advice.