My daughter has swelling and a large sore on the corner of her mouth. Took her to urgent care two days ago. They prescribed a type of penecillin, but Benedryl temporarily takes the swelling down. Doctor said he doesnt know what it is. I figured the swelling would go down by now if it was a bug bite.
Hello, Thank you for your inquiry. Cold sores are common to appear outside if the mouth and would be my possible diagnosis with your description. Typically, they are contagious and of viral origin. This may last 7-10 days with no cure. Topical Chat Doctor.  Prescription anti-viral medications such acyclovir and acyclovir work best when taken during the first two days of the symptoms appearing. Avoid acidic and spicy foods. Cold packs and gels with endocrine or other numbing ingredients may offer relief. Ben