E-E-E-E-E-Y-OUCH!! (update in the comments)
Don't do what I did! Our neighborhood women had a pot-luck dinner tonight. I picked up my next-door neighbor and headed to the party site with my roaster/crock-pot full of pork tenderloin with cherry/cranberry sauce (It was a big hit!) As we entered the house, going through the den into her kitchen, I hit my knuckle on the door jamb. It hurt a little, but I really thought I had just grazed it. Within five minutes, a lump the size of a small egg had formed on the back of my hand, and it hurt like the dickens! I didn't want to make a big deal over it, so I went out into the backyard where other people were gathering. I grabbed some ice out of the bucket where drinks were cooling and poured myself a glass of wine, then held the ice on my left hand until it melted. I did that three times more, but as you can see, it did little good.
It is not as noticeable in the photo, but the swelling over the bruise is raised up about 1/4th+ inch above the rest of the hand. When I got home, I held an ice pack on it for 20 minutes, but I think it was too late to do much good. Maybe it will be better in the morning. Ya' think?