I thinik I was bitten by something 3 weeks ago in 4 different places on my body.  3 bites have gone away.  The one on my stomach started as a small ante hill but is now very painfull and has a lump about an inch long by a 1/4 wide.  This bit is very painfull.  Six inched about the lump is totally red and hurts.
Might that bite place is infected. And now develops cellulitis. U have to take antibiotics for at least 7 days and watch for sign of improvement.