I dont know if this is an abscess or not but my semi-feral cat might have one. About a week and a half ago I noticed that my feral came over to me and had yellowish green stuff on her fur she was cleaning it so I thought it was just somthing she got on her. I did notice a bump on the back end. I wasnt sure what it was I thought it might of been the stuff sticking to the fur making a clump so I didnt think it was anything too bad. Now for the past few days shes been licking he area so I started to look up scratches and bites because she has been playing with her sibling alot since it has been showing up more now. After reading about abscess i was starting to think it might be one so i quickly got a cotton ball and cleaned it with half hydrogen peroxhyd and water. What should I do know shes had this for a about 2 weeks now and didnt show any signs of a fever and didnt lose her appetite do they just heal after a while? cause how would it survive if i wasnt taking care of her?