. You may take oral antihistaminics like benadryl or zyrtec.Also apply calamine lotion as it has a soothing effect on the skin. You can apply OTC steroid cream but it is only helpful if applied right away, before blisters appear, or much later, when the blisters have dried up. Compresses with cool water or Burrow’s solution (available without prescription) can help dry the ooze faster.
Severe cases like extensive blistering and when rashes are present on the face may need oral steroids. But they are available only on prescription. So if the symptoms become severe then pls consult a dermatologist.
I hope that helps.Take care and pls do keep me posted on how you are doing or if you have any additional doubts.Kind regards.