To get rid of red rashes fast, you should choose the right method depending on the cause. Red rashes can be caused by skin allergies or diseases such as prickly heat. Oral medication or topical medication can be used to treat the cause of the rash. 1. Skin allergy: If the skin has stress inflammatory lesions caused by allergy and a red rash appears, first of all, we should pay attention to avoiding further contact with allergens, and then cooperate with anti-allergy drugs, such as loratadine, cetirizine, etc. for treatment. 2. Prickly heat: If it is caused by hot weather and poor sweating, it is mostly prickly heat, which can be treated with external glycerine lotion and oral lortadine hydrochloride tablets. During this period, pay attention to the cleanliness and hygiene of the skin, and try not to scratch with your hands. Pay attention to diet, do not eat spicy acidic food, do not drink alcohol. Red rashes can not be ruled out other causes, it is recommended that patients go to the hospital dermatology department in time, after a clear diagnosis, under the guidance of the doctor symptomatic treatment.