When hair loss and itchy scalp occur together, seborrheic alopecia is considered, mainly due to seborrheic dermatitis. Seborrheic dermatitis is mainly related to allergy, irritation, overwork, lack of sleep, mental stress and other factors. You need to pay attention to the diet, do not eat spicy and stimulating food, do not eat greasy food, eat less seafood, from the overall conditioning of the body. Then with antihistamine oral medication, topical ketoconazole lotion, Celebrex lotion and other common treatment. Through the adjustment of medication and diet, very good results can be achieved. In terms of hair washing, you can use anti-dandruff shampoo with ketoconazole lotion for better effect.