Hiii From your description you cud be suffering from urticaria. This is an allergic reaction. It can b a reaction to any food,pollens,anything in the air,hot or cold water, any medication s,any thing your applying daily, etc and many more. You need to observe properly. You can visit a dermatologist for the same. The doc can tell you to get a few tests done that helps us to kno the cause of allergy an then prescribe you medicines accordingly. You can see us for the same.