from the pictures, it looks like hives or contact dermatitis. The other possibility is of atopic dermatitis. Hives are red, itchy, raised areas of skin that appear in varying shapes and sizes. Take some antihistaminic like Benadryl or Claritin. You can also apply calamine lotion on the rash. It will help in soothing the skin. A mild corticosteroid cream like dermacort will also help.
If the symptoms persist then please get an evaluation done from a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Can somebody comment in my post please. M too worried bout the rash.