Small bumps on the hair may be caused by scalp folliculitis, seborrheic dermatitis, epidermal cysts and other diseases.
1. Scalp folliculitis: is a scalp follicle involvement mainly inflammatory skin disease, mostly due to bacterial infection, can also be induced by scratching, extrusion, friction scalp. Performance for the scalp appear red follicular inflammatory papules, part of the center can appear pustules, so that the symptoms of small bumps on the hair.
2. Seborrheic dermatitis: mostly occurs in the head and face, mainly manifested as erythema, with greasy scales or scabs on the surface, accompanied by itching. It may be related to the colonization of Malassezia, increased lipids, and impaired skin barrier function. The patient will have the phenomenon of small bumps on the hair.
3. Epidermal cysts: mostly occurring on the head, face and upper trunk, may be primary, or may be caused by the destruction of hair follicles. It is a round elevated skin swelling, thus manifesting as small bumps on hair.
There are many reasons that lead to small bumps on the hair, and it is recommended that patients go to the hospital in time to clarify the cause of the disease.