How to treat scratch by a cat?

Normally I would just leave it. If you wanna be on the safe side, rinse it with water. Or with anti-bacterial soap.

You should always wash any scratch with soap and water. Then you should use hydrogen peroxide and let it bubble up on the wound for a few seconds rinse with water and repeat 3 times.

Next use triple antibiotic ointment or cream and place a Bandaid on the wound. Cleanse the wound as I explained above twice a day until it's healed. Also, each time you change the Bandaids let the wound get some air for about 1/2 hour if possible.

Watch for puss, oozing, green, yellow or even white creamy discharge! These could be signs of infection.

Cats can sometimes have a particular bacteria in their nails from dirty litter boxes which when human blood becomes exposed a disease called Cat Scratch Fever can develop. If you notice an infection, get a fever or develop moderate to severe pain you should call your doctor or go to your local quick care center.

Hope you're feeling better soon!

ps. the reason why i say to take these somewhat "extreme" measures is because Cellulitis (sp?) and Staph infections are on the rise again!! i myself and quite a few people i know developed Cellulitis from small scratches or cuts. friends from all over the country and not just in my area. the ER dr. told me they are seeing an enormous increase with these infections. so, better to be extra careful.

You treat the scratch the same as you would any injury that breaks the surface of the skin. Normally, soap and water. If it bleeds, that is a positive as it flushes anything out of the wound. If you wish, you can put something like Neosporin in it, but that usually is not necessary. If the scratch gets warm or stays red, that suggests an infection.

Most of the time, things will heal fine.

I just leave sratches alone. My animals are always scratching me. But only when we're playing. I play rough with my animals. ;)