Re: ringworm on breast???
The black light is usually a UV light and not actually 'black' like in nightclubs. If you have a friend that is a nail technician and applies UV cured acrylics/gels, you might talk her into letting you put the cats under her light. All the lights will have to be off and you will have to do itin a darkened room. If the cats have ringworm, it will show up as tiny circles on their skin under the light.
Yes, I have heard that Blue Star will 'kill' the fungas, but I'm not sure you should use it on your pets since they lick themselves all the time. If your cats are infected, they will continue to re-infect you, whether the spots show up on your breast from holding them, or elsewhere on your body where they may rub themselves.