The causes of erythema on scalp include cutaneous lupus erythematosus, contact dermatitis, seborrheic dermatitis of scalp, psoriasis, etc. The treatment includes medication. 1. Cutaneous lupus erythematosus: because of autoimmune system disorders, resulting in erythema-like changes in the skin, which can involve erythema on the scalp, at this time, you can give methotrexate, morphenicol ester and other drugs to inhibit immune therapy, or glucocorticoid medications, such as prednisone, dexamethasone and so on. 2. Contact dermatitis: due to contact with certain sensitizing or irritating substances lead to metamorphosis, can also cause scalp erythema, accompanied by itching, tingling and other manifestations, at this time the need to clarify the cause and avoid re-exposure, while symptomatic treatment, such as external boric acid solution wet compresses, coated hormonal ointment, such as mometasone furoate, combined with oral antihistamines, such as cetirizine, and other drugs. 3. Scalp seborrheic dermatitis: occurs in the scalp area, the beginning of the mild flushed plaque, covered with grayish-white furfuraceous scales, can be treated with topical hydrocortisone cream or tretinoin chloramphenicol cream. 4. Psoriasis: the typical manifestation is clear boundary, shape and size of the erythema, surrounded by inflammatory red halo. Available carbotriol, tacalcitol, glucocorticoids such as hydrocortisone cream and other medications. In addition, there may be other causes of erythema on the scalp, such as skin infections and inflammation, etc. It is recommended that the phenomenon of erythema on the scalp please consult a doctor in a timely manner to find out the cause of the above medication, please follow the doctor’s instructions to use.