Suggest Treatment For Pea Sizes Swelling In Mouth With Head Ache

the insect bite is just to the side of my mouth almost on my chin, I thought it was a pimple at first, but there seems to be a little swelling in my mouth in the cheek area and on the outside it is red almost the size of a pea. I am occasionally getting a sharp headache pain on that same side and the area where the bite is aches occasionally, in fact, I almost feel like I have a tooth ache at times. This does not itch at all and I have tried putting a hot washcloth on my face there which seems to give a little relief, but not for long.