What is the cause of red bumps on the head?

There are many possibilities for red lumps on the head, specifically the following possibilities: 1, seborrheic dermatitis on the scalp, mainly due to local inflammatory reaction red inflammatory lumps. 2, folliculitis on the scalp, mostly due to infection bacteria to form local inflammatory reaction, when the scalp is infected with folliculitis will show red lumps. 3, may be fungal infection and the formation of local inflammatory reactions, such as ringworm, if the performance of ringworm may form local inflammatory papules and exudative reactions showing red pimples. 4, may be allergic factors formed, the most common is due to local contact dermatitis or eczematous dermatitis, the formation of local papules, herpes and so on. 5. Virus infection may also show red pimples on the head, such as local erythema, papules, mounds and other red pimples due to infection with varicella zoster virus.