50-year-old middle-aged people with reddened skin and itchy skin, can consider the occurrence of exfoliative dermatitis, tinea corporis or psoriasis and other diseases. 1. Exfoliative dermatitis: it can be seen in drug allergy caused by drug rash or secondary to certain skin diseases (such as eczema, psoriasis, etc.), at the beginning, the skin is red, the affected area is bright red and dry, the surface of the skin can be scaly, can be peeled off and then generated, with the degree of itchiness is not certain. 2. Ringworm: caused by dermatophyte infection, skin lesions at the beginning of red papules, papules or blisters, and then can form scaly red patches, conscious itching, long-term scratching and stimulation will cause eczema-like or moss-like changes. 3. Psoriasis: If psoriasis is common type, the lesions are red papules and macules at the beginning, which can be extended to plaques and covered with silver-white scales in the form of layers, and it is itchy consciously; if it becomes erythrodermic psoriasis, there is diffuse redness of the skin all over the body, infiltrated and swollen, and a lot of furfuraceous scales appearing. Reddening and peeling of the skin and itching manifestations, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for treatment, and pay attention to local skin care.