Thanks for the query,
You might have developed a nummular eczema
Your description matches with this.
Apply a steroid
lotion like fluticasone
Also take an antihistamine tablet
Try saline compress.
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.