Puncture in Cat's Back Leg

My cat has a puncture wound, very small and clean, in her back right leg, just close to her tail. It didn't seem to be bugging her, I just noticed it and cleaned it (she got upset over being treated and I didn't want to try and get a picture of it. I can post one later if it would help). The puncture wound itself looks clean, but it's missing the fur around it in about a two inch radius, and there's a purpilish nebula like thing around the puncture. She doesn't show signs of having been in a fight, and it's spring and cool where I live so I don't think it could be warbles. I can't take her to a vet right now, so any advice as to what the puncture could be from would be appreciated. I'm worried it could be something internal.

Hello!  My advice would be to take her to the vet soon, I'm afraid.   I don't know your which country is, or its parasites, so I'm going to ignore that possibility for now.  Aside from that, other possibilities include a bite wound or a shot from a pellet-gun.  That's a dangerous area to damage because the back end of the gastrointestinal tract (rectum) must crucially stay intact!  It sounds as though the purple may be bruising. The problem with puncture wounds is that they carry infection straight to the sterile inside of the body and thus infection can become systemic very quickly, potentially with deep abscesses or putting bacteria into the blood. Because this possibility exists (and indeed, is surprisingly common), it is worth finding time to go to the vets now rather than waiting.  Best of luck.