Sores on the back of the head may be due to folliculitis on the back of the head, or seborrheic dermatitis, which is a localized skin condition on the back of the head, and seborrheic dermatitis may be secondary to bacterial infection, resulting in local inflammatory reactions or redness. For this area of the back of the head, if these conditions occur, they are mostly due to local infection or poor local hygiene, resulting in a secondary bacterial infection. Whether it is folliculitis or seborrheic dermatitis secondary infection, it is formed due to infectious factors, so for this condition, while actively treating with antibiotics, it is also necessary to use topical disinfectants or anti-inflammatory topical medications, usually fusidic acid cream, mupirocin cream, etc.