Most likely it is ants if you are absoultely sure it isn't ants then he might be haveing an allergic reaction. You might want to check with your vet.
wheal
The most common cause of bilateral neck welts in the lymph nodes is mononucleosis. This is a viral infection caused by the Epstein-Barr virus.
Urticaria
Parasites of some sort or infection or just a skin condition ANSWER: Often, this is caused by hives (which themselves can be caused by an allergic reaction, or simply by stress or anxiety).
Hives
The Welts was created in 2004.
Rick Welts was born in 1953.
My run through the thicket has raised some welts on the exposed parts of my legs and arms.
Yes you can.
oh ya
Maybe dyshidrosis
Anytime you are hit very hard you will develop welts underneath your skin. If you are playing to close paintballs can also break the skin.