It looks like Herpes simplex
Thank you for posting in health care magic.
As per your description, it looks like Herpes simplex virus infection.
The lesions are seen when the immunity of the person gets reduced due to Fever
I prescribe Acyclovir
tablets along with Acyclovir ointment to the people who present with similar complaints.
The lesions will disappear even without any treatment.They disappear spontaneously with in few days without treatment.
I request you to consult a Dermatologist
and proceed accordingly.
If you have any queries, I will clarify further.
Wish you good health.