What Is The Treatment For Swollen And Bruised Leg?

Hi. today I scratched my leg with an old nail. The scratch was very little but I blet. I didn't had a chance to was it. I put a plaster on it. I had the chance to wash it after about 6 hrs. Now the scratched place is a bit swallowen but not reddish and when i move my joint it aches. Will I get teraenus this way?