A bulge at the back of the head may be caused by diseases such as folliculitis and sebaceous cysts.
1. Folliculitis: folliculitis is mainly characterized by redness, swelling and pain at the root of the hair follicle. When the local skin is infected by pathogenic bacteria, it can cause local tissue swelling, and even hard knots, then the bulge will be formed.
2. Sebaceous cysts: This is a common skin disease, due to the sebaceous gland discharge ducts are blocked, thus forming sebaceous cysts and nodules. If the growth of the lump is slow, it is considered to be by external force or stimulation and other factors, complicated by bacterial infection, at this time there can be localized ulceration, redness and swelling and other symptoms.
A bulge at the back of the head, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.