The sudden appearance of red patches on the body may be due to psoriasis, contact dermatitis, acute eczema, papular urticaria and other causes, mainly to drug treatment.
1. Psoriasis: the typical symptoms are scaly red spots or plaques, which are localized or widely distributed, mainly on the extensor side of the limbs and lumbosacral area, and may be accompanied by the damage of nails and scalp. Under the guidance of the doctor for a short period of time, local topical use of halometasone cream and other glucocorticoid drugs, can also be combined with carbotriol and other vitamin D3 derivatives or vitamin A acid drugs for treatment.
2. Contact dermatitis: when the body comes into contact with certain exogenous allergic substances, erythema, papules and papules may appear locally, and the lesions are often red or dark red, accompanied by itching. Under the guidance of the doctor can be oral loratadine, benadryl and other antihistamines to relieve itching, with the external use of glycerine lotion, hydrocortisone butyrate ointment and other drugs to relieve the symptoms.
3. Acute eczema: a variety of internal and external factors lead to skin erythema with pimples, blisters, oozing with intense itching and other symptoms. Under the guidance of the doctor can use glycerine lotion or application of glucocorticoids, such as topical betamethasone ointment, dexamethasone ointment and other relief.
4. Papular urticaria: This disease is usually caused by mosquito bites, local skin allergic to mosquito secretions and appear red spots with itching. Under the guidance of a doctor, you can use compound menthol ointment or hydrocortisone butyrate and other hormone ointment to improve the symptoms.
If red patches suddenly appear on the body, it is recommended to go to the hospital, do not self-medication, should be clear about the specific cause of the disease, under the guidance of the doctor to give standardized treatment.