Thanks for the query.
You have developed an allergic reaction
Apply a mild steroid lotion like desonide
Also take an antihistamine tablet.
Better to take avil in night and allegra in day.
Both are anti histamines
This will give you some relief.
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.