Red patch-like things on the body, the diseases considered are acute urticaria, chronic urticaria, pityriasis rosea, as follows: 1. Acute urticaria: Consider acute urticaria, will appear on the body a piece of red spots, wind masses, and within 24 hours to subside, this is a skin allergic diseases, common causes are skin allergies, can be eating food, drugs, and contact with the air dust mites, pollen These inhalants are caused by. Do not worry, this disease is very common and relatively easy to deal with. If the symptoms are mild, you can take oral loratadine tablets and apply topical glyburide lotion. If the symptoms are more serious, and accompanied by abdominal pain, chest tightness, it is necessary to go to the hospital for emergency treatment, such as oral methylprednisolone tablets. 2, chronic urticaria: if repeatedly recurring episodes for months or even years, is chronic urticaria, in oral medication can be given compound glycyrrhizin tablets and orotadine hydrochloride tablets, while in topical medication can be mixed with mometasone furoate cream and urea vitamin E cream for external use It is best to suggest the patient to the dermatology department for allergen detection. 3, pityriasis rosea: can be considered as pityriasis rosea, mainly the body appears round, red patches, covered with fine scales, which is pityriasis rosea. Mainly in the fall and winter is more common, occurring in the trunk, at first is 2-3cm in diameter round, called mother spot, 1-2 weeks later slowly appear small purple spots. It is uncomfortable and does not require treatment, and can heal itself in 6-8 weeks. If the itching is obvious and does not subside all the time, you can take oral levocetirizine hydrochloride tablets and apply topical halomethasone cream at the same time. Therefore, for red patches on the body, it is recommended that patients go to a regular hospital and undergo appropriate laboratory tests under the guidance of a dermatologist to guide the clinical treatment.