What is the reason for the small red pimple on the scalp?

Small red bumps on the scalp may be caused by folliculitis. It may also be an inflammatory reaction caused by seborrheic dermatitis. If folliculitis is caused, most of them are caused by bacterial infection, scattered in the larger kind of papules, accompanied by tenderness. Bacterial infection causes redness, and later some will be accompanied by pus. Therefore, when this folliculitis shows up, there must be some redness and pain. If hidradenitis or seborrheitis is caused, there may also be some pain, but the pain is not obvious, accompanied by certain itching symptoms. Seborrheic dermatitis, which has scaly seborrheic dermatitis often manifested as red hair follicles, papules with small pieces of bran skin, and hair thin and sparse. If it is accompanied by pus spots or severe itching, accompanied by scales, it is likely to be combined with fungal infection. It is recommended to use ketoconazole lotion to wash and apply some antifungal ointment.(The use of drugs should be carried out under the guidance of a doctor.)