Itchy scalp in summer is considered to be caused by seborrheic dermatitis, tinea capitis, and psoriasis vulgaris. Under the guidance of a doctor, it can be treated by applying medication. 1. Seborrheic dermatitis: usually caused by abnormal sebum secretion, Malassezia infection, immune factors, epidermal barrier damage and other factors. Usually the affected skin will have itching, erythema and flaking skin flakes, which are greasy white or light yellow in color. It can be treated by applying tacrolimus cream, vitamin B and other medicines under doctor’s guidance. 2. Tinea capitis: usually caused by factors such as plaster-like microsporidium, canine microsporidium and rust-colored microsporidium infections, manifesting as hair loss, curling and bending of hair accompanied by erythema of the scalp, flaking, itching and other symptoms. It can be treated by applying drugs such as itraconazole and terbinafine under the guidance of doctor. 3. Ordinary psoriasis: usually caused by genetic, environmental and autoimmune factors, manifested by erythema, itching and other uncomfortable symptoms. Under the guidance of the doctor, you can apply topical corticosteroid ointment, calcipotriol and other drugs. Warm tips: If the symptoms are obvious, you must consult a doctor in time, and follow the doctor’s instructions for medication, so as not to delay the condition and affect the treatment.