Red bumps on the scalp, may be related to folliculitis, contact dermatitis, but also to understand whether it is related to other diseases. 1. Folliculitis: usually do not pay attention to scalp cleanliness and hygiene, sweat and dirt stimulation, resulting in scalp itching. Often scratching the scalp, there are small injuries, pathogenic bacteria invade the hair follicles causing folliculitis, resulting in red bumps on the scalp. 2. Contact dermatitis: the occurrence of contact dermatitis is related to contact with exogenous sensitizing substances, resulting in local acute and chronic inflammatory reactions. For example, the use of inappropriate shampoos or hair dyes can lead to localized red bumps. 3. Other diseases: scalp psoriasis is a skin disease, if it occurs in the scalp area, resulting in the local appearance of red plaques, pimples, but also accompanied by varying degrees of itching, burning and other symptoms. The causes of red bumps on the scalp are more, it is recommended to do a good job of local care, avoid scratching and stimulation, but also to the hospital, combined with the doctor’s advice treatment.