Lice on the head is an infectious disease and lice are often parasitic on the scalp and in areas where hair growth is more vigorous. If the cleaning and care of the head is not complete, the hair is too long, or there is inflammation at the scalp, such as seborrhea and folliculitis, the symptoms of head lice may be more severe. If there is head lice growth, it is recommended to keep the head clean and dry first, while taking care to control the symptoms of bacteria and folliculitis in the head. In addition, you can also cut your hair short and do a good job of scalp cleaning and hygiene, which can be more effective in preventing the growth of head lice.