If the scalp is often itchy and hair falls out, consider seborrheic dermatitis combined with seborrheic alopecia, when the primary disease should be actively treated. For dermatitis, you can take oral olopatadine hydrochloride tablets or avastin capsules with compound glycopyrrolate capsules and apply compound ketoconazole hair shampoo or selenium disulfide shampoo three times a week, and apply trimethoprim ointment or fluticasone propionate ointment on the affected area to promote the local appearance of scales and papules to subside. For hair loss, it can also be combined with the application of Chinese herbal medicines, such as Jing Wu capsules taken orally. During the treatment period, you can apply a comb to comb your hair frequently to promote blood circulation in the scalp, accelerate the improvement of the rash and promote hair growth.