my 12 year old daughter got a red welty rash on her left side from mid torso down to her waist . we put benadryl on it and it went away. today it was on her left leg from mid thigh to below her knee and behind her knee. also behind the other knee. gave her a cool bath and now she has it on her waist line, under her left breast and behind her right knee. it itches then the rash seems to spread.
Hello True It can be Urticaria so important thing is don't give any spicy food, junk food like chocolates, ice cream, pizza, cheese and all fried food. Ask her to Chat Doctor.  Give her healthy vegetarian diet. And give following medicines for 1month-1- Mahamanjisthadi Kaseya 3tsf mixed with 5tsf water after food twice daily.2-Tab Need 2tab twice after food.3-Tab Habitat 2tab bedtime with warm water.4-Tab Liv522tab twice after food. After that let me know how she is feeling. Take care.