Rough skin with granularity on the legs may be caused by physiological reasons, such as dry skin, or pathological reasons such as keratosis pilaris, ichthyosis, psoriasis, tinea corporis and so on. 1. Physiological reasons Dry skin: when the climate is dry or the body lacks water in autumn and winter, there may be a decrease in subcutaneous blood flow, which leads to insufficient supply of nutrients to the skin, resulting in rough skin with a granular sensation, which is a normal physiological phenomenon, and it is enough to pay attention to moisturizing in normal times. 2. Pathological causes (1) Keratosis pilaris: rough skin on the legs with a granular feeling may be keratosis pilaris, is a disease of abnormal skin keratinization, with heredity, vitamin deficiency, metabolic disorders, etc., can be manifested as rough skin with a granular feeling. (2) Ichthyosis: rough skin on the legs with granularity may be ichthyosis, is a kind of dry skin, accompanied by rough ichthyoscale flaking keratinization abnormal disease, can be manifested as dry skin. Roughness with granularity. (3) psoriasis: rough skin on the legs with granularity may also be psoriasis, its etiology is not clear, may be related to genetics and the environment, etc., there may be repeated episodes of scaly erythema, pimples, etc., the lesions can be dry, and touch will also have a rough granularity. (4) ringworm: rough skin on the legs with granularity may also be ringworm, thigh skin infection with fungi, can interfere with the normal skin cell proliferation and differentiation, so that the skin appears pimples, erythema, etc., which can make the thigh skin rough with granularity. Rough skin with granular sensation on the legs, it is recommended to go to the hospital in time, to clarify the cause of the disease, under the guidance of the doctor for professional treatment.