Inflamed Skin Tag Dog Bump On Jaw?

Bump on jaw? - inflamed skin tag dog

Hello!
I have a bruise, a little smaller than a cent to the point where my jaw just below the ear hinge. It is very sensitive and feels warm, not hot, the surrounding area swollen. I only noticed yesterday. The only thing I can think of that distance that is approximately four inches, had the day from the neck skin is removed before 3 weeks and the site became red, swollen, tender and swollen. For more information: I am 34 years old, 33 weeks pregnant and confused.
Thank you for your help in solving my mystery!