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This could indeed be an insect sting or bite that caused the swelling. If you believe that might be the case, benadryl at a dosage of 1-2mg per pound every 8 hours to control the swelling.
However, this could be a sty or growth or even a hair follicle that is becoming infected or clogged. You will need the sty or growth looked at by your Vet as it may start to affect the way your dog's eyelashes set and start irritating the eyeball leading to an eye infection or scratches to the eye or corneal ulcerations from the constant rubbing of the growths against the eye.
Early prevention is best in these cases. If it starts to irritate her, you can use sterile saline solution like contact lens wearers use to rinse her eye.
An infection of the hair follicle should clear with antibiotics as should a sty. However, a cyst or other growth might need to be removed. Since this might be tumors, I'm going to give you a site on these.
I would recommend having this checked over by your vet tomorrow to determine the exact nature of the bumps and so treatment can be started.
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