A small piece of skin is rough like ringworm, which may be related to localized excessive friction of the skin, or may be caused by dermatitis eczema, psoriasis and other reasons. 1. Excessive friction of localized skin: due to the influence of certain factors, the localized skin of the body is rubbed excessively for a long period of time, resulting in the proliferation of the skin in the area, which will cause the small piece of skin to be very rough like ringworm. 2. Dermatitis eczema: usually due to local skin allergies, resulting in chronic inflammatory reaction of the affected skin, under the stimulation of inflammation, which can lead to the affected area of the skin is rough like ringworm, but also accompanied by itching symptoms. 3. Psoriasis: can lead to the affected area of the skin red patches, covered with white scales, resulting in localized skin is very rough like ringworm, and accompanied by obvious itching symptoms. A small piece of skin is very rough like ringworm, if accompanied by obvious symptoms, should be as early as possible to seek medical attention, improve the examination to clarify the cause of the disease, under the guidance of the doctor for targeted treatment.