You should have your vet take a look. Your kitty may need medication for something like acne, a staph infection or may even be because your kitty needs some dental work. They will have a better idea once they are able to take a look.
Why is my cat having bloody scabs appear around her mouth?
Because of any deficiency or the cat must had eaten pieces of glass while eating food take your cat to the veterian or it may effect the immune system also