Sudden itchy palms may be related to eczema, tinea versicolor, atopic dermatitis and so on. 1. Eczema: It may be related to eczema caused by contact with washing powder, detergent and chemicals. It can occur on both palms, symmetrically distributed, usually accompanied by itching. 2. Ringworm: due to fungal infections such as Trichophyton floccosum and Trichophyton erythropolis, rashes such as erythema, papules and blisters may appear on the palms of the hands, accompanied by itching. 3. Allergic dermatitis: the hand contact with certain allergic substances appear metamorphic reaction, manifested as erythema, itching. Sudden itchy palms can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or treatment.