Symptoms of erythroderma include erythema, furfuraceous scales, and itching. Erythroderma is mainly caused by the infection of fine rod-shaped bacillus, and patients will have localized erythema, which has a smooth surface and irregular edges, and gradually turns into brownish-red or brownish-red with the development of time. If the standardized treatment is not carried out in time, furfuraceous scales and tinea-like changes may appear on the patchy lesions, resulting in rough and hypertrophied skin accompanied by itching. Erythroderma is widely distributed on the limbs and trunk, and is accompanied by significant itching. Scratching the skin due to itching may lead to skin damage, which may cause secondary infections. If the above symptoms occur, it is considered to be caused by ringworm, it is recommended to go to the regular hospital for examination to clarify the cause of the disease.