okay this has occured before, my dog has a huge bump under her eye, we don't know what it is but we think it's the pollen problem were having in georgia

Is your dog rubbing his/her eye, or scratching it? Could be allergies, but I suggest you go to the vet. Good luck

It's possible it could be allergies. Some antihistamines would help with that, like Benadryl.My first thought however is a tooth root abcess. If you lift her/his lip and look at the teeth are they shiny and white with no chip, breaks, or cracks? Or are they covered in tartar with a red gum line? Usually an abcess, or pus pocket, will form as a lump under the eye due to a bad upper tooth on that same side. Usually the largest premolar, the carnassial.A warm compress on that area may help. If the swelling doesn't resolve in a day I would take her to your regular veterinarian.