Hello.
Thanks for posting your query at DoctorSpring.com
I can understand your concern.
This seems to be erythema multiforme which could be due to viral infection like herpes virus.
I would recommend taking anti viral medication like valacyclovir. That will help to resolve the lesion. You can apply cortisone cream on the area once a day for five days. You can add clotrimazole cream which can be mixed with cortisone cream n applied to prevent secondary fungal infection.
Please let me know if you have any queries.
Regards.