Help me please, about cuts and laserations?

My cat Rukus has allergies, which creats bumps/lumps on her ody, she had a bump on her back and somehow it has created a HUGE cut on her back and is bleed, bad, not bad enough to send her to emergencie, but bad enough for me to be writing about it on this website, I need to know how to make sure the cut doesnt get infected, but remember, its a cat can anyone help me please??!!