What can I do about my injured cat?

My stray kitty, which I've been taking care of for about eight months, tangled with another animal and has a patch of fur missing. I can see his pink skin, and there's a little puncture wound maybe the size of a marker tip.

Anyway, when this happened a few days ago, the wound didn't look bad at all. Now, four(?) days later, it is dripping blood and clear liquid. The cat keeps licking at the wound, which I think is preventing it from healing.

I don't have a vet and the cat won't let me pick it up or put it in a container. Should I be concerned? Is the liquid maybe just puss from the wound healing? Is it from being infected?

Also, any ideas how I can get the cat to stop licking at the wound?

Thanks for your help! Lil' kitty will greatly appreciate it!