Hi,
You could be having an allergic reaction to some substance .
What other symptoms are you having? Let us also know if you have any past history of any allergic reaction or any family history of allergies, etc.
You could apply calamine lotion at the site and see if it helps. Use a lip balm with a sunscreen - preferably a medicated one and wash your face several times a day.
You could take oral antihistamine medications for a few days and see if it helps with your symptoms.
If the lesions still persist talk to your doctor about it and see what needs to be done after a proper clinical examination.
Let us know if you have any other doubts or queries.
Hope this helps.
Good luck.
could just be steress try zyrtec it can help