Hi Dear , Welcome to HCM. Understanding your concern. As per your query you have symptoms of hives which are due to excessive heat, cold, environmental change, insect bite , pollen and some plants, pressure and sun exposure . It is the body s response to the trigger factor. Need not to worry. The most important thing is to find the trigger factor. Stay in cool environment. I would suggest you to give cold compresses to hives several times a day to prevent from swelling and itching and take over the counter antihistamine drug like benadryl. If symptoms still persist the consult dermatologist for proper examination and treatment. Doctor may prescribe other steroid cream, anti inflammatory drug or drugs that can suppress immune system. Doctor may perform skin test and challenge to find out the trigger factor. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari