The hair follicles are infected with inflammation caused by hair follicles, may be related to the following reasons: 1, do not pay attention to personal hygiene, folliculitis most common pathogens are Staphylococcus aureus and Malassezia, Staphylococcus aureus belongs to the epidermis colonizing bacteria, the number of this bacteria will be significantly lower in the people who bathe on time, when not pay attention to personal hygiene, the number of this bacteria is higher, more likely to cause folliculitis. People who do not bathe frequently have richer skin oil, which is more likely to block pores and form folliculitis, and is also conducive to the growth of Malassezia. 2. high oil secretion. 3. decreased personal resistance. 4. repeated scratching.