im trying to figure out whats on my leg. i noticed a bite a the other night,it looked like eithr a tick bite ,or bug bite.so i scratched it a little bit not knowing what it is,later on it looked like there was a little puss coming out or somthing wet.now theres like a dark green scab and i have a feeling its infected,it looks a little swollen and theres a tiny red rash around it,people tell me it could be staph infection, lyme disease , cellulitis ,can someone tell me if its serious or just a simple bug bite?