Well, he sounds like he may have been too rough. Remember, if it hurts, stop them. And always make a boy respect you! You are worth treating just right so settle for no less. Probably he had no idea what he was doing though. So, friction can cause swelling. Fingernails can cut you. Dirt on hands and fingernails can give you an infection. You can't get pregnant so don't worry about that. To get pregnant, you really need a penis in the vagina. So, don't worry about pregnancy. Keep the ice pad on. If not better, then you may need to get checked out. I'm the mom of a 16 and 14 year olds. They get the option of seeing a doctor by themselves. I take them and they can go in and I wait or I go in with them. Think that would float with your mom? Most likely it will get better by tomorrow though.
I'd say, don't let this guy do this again. He's not worth the pain, the possible infection, and the stress of scaring yourself about pregnancy. Age 15 is kind of young for hand jobs, besides. When I was first seeing guys I was sort of subliminally concerned that if I turned down a guy he wouldn't come around any more, and if I had a big crush on the guy that would be enough to have me do stuff that otherwise I wouldn't have chosen. If I could give advice to my younger self it would be that I should have stood up for myself and not done one thing that didn't feel absolutely perfect. All guys are glad to try for sex, I had the power to pick and choose and didn't even realize it. So, this guy's technique (or his results) hurt you, you say to him that you don't want to do it. Other guys exist who will be more exciting and not have unpleasant after-effects.
Go to your school nurse but more than likely they might report it to your parents. You might have to go to a doctor for a possible infection for antibiotics. Anyway, you might want to get on birth control if you are having those type of encounters.
Girl! Soak in a clean tub full of hot water with about 1 1/2-2 cups of distilled white vinegar... It's ok to use some aloe vera or triple antibiotic ointment on your labia- outside only. Treat your vaginal/clitoral area with care. Pamper it. And make sure everyone else does too. No one else is in your skin so they don't know how it feels to you. It is your place to not only tell them but, make sure they heed what you say. It's not ok for him to hear you say ouch and see you wince and then keep going. That means he's purposely overstepping, which means disrespect. And you have to decide if he wants to disrespect if he still get to play... Also, just because he wants to do something doesn't mean that he's prepared, meaning: nails clipped and cleaned, hands clean, examine skin for scratches or scabs. And yes, call your doctors' office and see if you can by yourself to get an examine on your own.
Definitely sounds like he was way to rough! If it doesn't feel good than tell them to stop! Sometimes when they're young they really don't know how to touch a woman and have to learn. Also he needs to respect you and make sure to keep his semeen away from your vagina it doesn't have to slip in to get some of those swimmers in there!! Keep it iced and most likely it will get better on its own!