Bumps on the head is a very common skin disease, for bumps on the head is mainly to consider the following reasons: 1, consider the sebaceous glands of the scalp or folliculitis, because the scalp is too oily, and the daily diet and routine, etc., such as eating too many greasy things, or irregular work and rest, often stay up late, will lead to the scalp follicles secrete too much oil, blocking the sebaceous ducts will cause seborrhea or 2, If you do not pay attention to scalp hygiene, it will also lead to the accumulation of oil and metabolites secreted by the scalp to form small bumps on the head. 3, Too much dandruff will also accumulate on the head, and bumps will be formed if the dandruff is very thick.