Industrial Piercing Swollen?

Don't play with it is the first thing I'd say, don't keep touching it to check if it still hurts, that's really not gonna help. If it's infected it would feel hot, if it does then you should probably start to worry. Could be the piercer didn't pierce as straight as he should of and now it's applying a bit of pressure on one end making it irritated, if you think that's the case you might want to get it changed with bio-flex until it heals. Try to avoid applying any pressure on it for the next bit till the swelling goes down (i.e. hats, sleeping on it).