Hard bumps on the scalp may be associated with sebaceous adenoma, common warts and scalp folliculitis.
1. Sebaceous adenoma: a benign skin tumor, a benign neoplasm caused by the proliferation of underdeveloped sebaceous gland cells, the cause of which is unknown and may be related to heredity. The head and neck are the most common parts of the disease, and in the clinic, it is mainly manifested as small pimples and nodules protruding from the skin, with a slow growth rate and no pain.
2. common warts: a disease caused by the infection of human papilloma virus, early manifestation of flat papules, surface roughness, and later can gradually increase to the size of soybean, the local can have obvious elevation.
3. Folliculitis: an infectious disease that occurs in and around hair follicles, associated with Staphylococcus aureus infections, mainly manifested in the clinic as a pustular pimple, and there will be obvious redness, swelling and pain.
Due to the complexity of the cause, the specific situation needs to ask the doctor for a face-to-face consultation.