Has my kitten been bitten by a spider or ant?

its only red ants that bite not black ones ,if it is a spider that has bit him then take him to a vet asap ,cleaning wounds or lumps etc i normally use warm salted water thats what the vet told me to use i wouldnt use alcohol on yr little kitten as he is 5 weeks and will lick it and well u will have a drunk anyway hope this helps u out and good luck