I am 38, 240 lbs, 5'0" and have allergies. I bruised my leg 2 days ago through having to stop myself from falling when getting in the tub by bracing my weight against my shin on the outside of the tub while the other foot was slipping on the inside of the tub. At first it looked like a bad bruise but I noticed yesterday the color wasn't really that bad but it was swollen, VERY painful and has a fever on and around it. What could it be?