My son is 9 years old. Yesterday he came home from school with a red rash on his forearms and inner thighs that almost look like welts. They are raised but not itchy. He is also complaining that his ankles/ feet and legs are sore. He is limping around and finding it painful to walk. I have given him nurofen, polaramine and phenergan to try to get rid of rash and pain. None are working. Today his ankles appear to have fluid in them and he is still in pain walking. Are these growing pains?