Thanks for the query,
There is a possibility that you have developed a drug allergy
Although it is uncommon with birth control pills,
But it can occur.
I would like to know since when you are taking these pills.
A photograph of lesions would have helped me better,
You can use a mild oral steroid
lotion like desonide
Also take an antihistamine tablet
This will give you 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.