Playing in the water after the body itchy rash is considered to be caused by allergic diseases, such as solar dermatitis, contact dermatitis, etc., may also be caused by mosquito bites, can be combined with the cause of the disease through the application of oral medication treatment as well. 1. Solar dermatitis: consider playing in the water when the skin is exposed to the sun for a long time, resulting in acute phototoxic reaction of the skin, there may also be burning, swelling, pain and other discomforts. Patients transferred to a cool place, avoid contact with the sun, can follow the doctor’s instructions for external application of glycerite lotion for treatment, if necessary, can follow the doctor’s instructions for local application of halometasone and other drugs. 2. Contact dermatitis: considered to be caused by skin contact with allergic substances, such as sewage, towels, clothing, dust, etc., usually accompanied by severe itching. You can apply local glycerin lotion to stop the itching. Serious cases, need to comply with medical advice oral loratadine, cetirizine and other antihistamine treatment. 3. Mosquito bites: mosquito bites on the skin while playing in the water will also make the skin itchy with a small red rash. If it is more serious, it may be accompanied by fever or other symptoms. When the symptoms are mild, you can use local saline or iodine povidone to clean, and after cleaning, apply erythromycin ointment locally. If necessary, you need to follow the doctor’s advice oral loratadine, amoxicillin and other drugs. It should be noted that there are certain adverse reactions to the drugs, before use must first consult a doctor, not blindly take the drug, and the process of taking the drug if there is discomfort timely feedback to the doctor.