Hope this hasn't started just after the geston shot, as geston can cause skin rash in some people. Also, make sure you haven't had anything for which you are allergic,  in food or by way of medicine . You can try neem bath to give you symptomatic relief. Boil neem leaves in water n have a bath with that water. Abstain from applying any cosmetics. If symptoms persist, better to consult with the doctor personally.

This might be due to allergy  if their is itching or burning then its urticaria . to treat it from root you need to start Ayurvedic medicine s

Good to get a correction for food sleep activity...