There is no such thing as an itchy scalp as a sign of any disease. Itchy scalp may be caused by ringworm of the head, seborrheic dermatitis, mosquito bites, prickly heat and other diseases. 1. Tinea capitis: generally caused by fungal infections such as Trichophyton mentagrophytes and Microsporum canis, patients may experience symptoms such as scalp itching and hair loss. 2. Seborrheic dermatitis: it may be related to Malassezia infection, abnormal sebum secretion, immune factors and other factors, the patient’s scalp may appear greasy scales, and accompanied by itching symptoms. 3. Mosquito bites: after mosquito bites, causing skin immunopathology, localized pimples, bumps, blisters and other symptoms may occur, and itching may also occur. 4. prickly heat: related to the environment, sweat infiltration, sweat discharge difficulties and other factors, the skin may appear raised small blisters or papules, some patients will be accompanied by pain or itching. There are many diseases that cause itchy scalp, it is recommended that timely hospital consultation, under the guidance of the doctor symptomatic treatment.