The flaky skin on the arms may be caused by dry skin, or it may be caused by psoriasis or ringworm. 1. Dry skin: If the weather is dry, the loss of skin moisture is usually faster, and if you don’t pay attention to hydrating and moisturizing the skin, it is easy to lead to dry skin, which can lead to the phenomenon of skin flakes. 2. Psoriasis: psoriasis, also called psoriasis, is an inflammatory skin disease, the main symptom is that there will be inflammatory red pimples on the skin, and then the pimples will gradually expand into red plaques, and the surface will be covered with grayish-white scales, and the scales will be peeled off, which will lead to dandruff. 3. Ringworm: ringworm is mainly caused by fungal infection, the main symptom is that there will be red pimples, erythema, blisters, etc., blisters will appear after drying dandruff. Arms off dandruff recommended to the regular hospital for relevant examinations, a clear diagnosis, so that targeted treatment.