I recently bought a young horse - YAY! Within a week, I noticed ringworm cluster about the size of my palm on the R side near girth/armpit area 
I feel bad for not noticing sooner, but she’s almost black. Horse came from a well-known sale barn with high turnover, so assuming a communal girth was used on her as mine is a brand new.
I’ve never had a horse with ringworm, but I’ve been reading up! I’ve dealt with cannon crud in the past with Equiderma lotion and all I’ve read says this is great on ringworm too. The girth area is healing up well 1 week post-discovery. But there are now a few random spots on a knee, near stifle and right side of tail, etc. that seem to be popping up. I’ve bathed every other day with chlorhexedrine shampoo or betadine scrub - it’s cold here. I’ve applied Equiderma and Listerine liberally to chase down the new spots a couple times per day. I feel like I’m doing everything I can topically!
Luckily my horse doesn’t seem overly sensitive to it and is tolerant of all the bathing, scrubbing and dabbing. It is all right that I continue to ride? Or is using a girth causing the fungus to spread? This is a youngster so I don’t want to go more than a day without some saddle time. I wipe down the girth, billets and bridle that come in contact with my horse with alcohol wipes immediately. I switch my pads and have bleached and/or sprayed my brushes with rubbing alcohol daily. I already wash my hands like crazy and spray them with alcohol too! Anything else I should be doing?
UPDATE: I wanted to thank everyone for politely telling me how to handle ringworm case safely. My vet did take a look a week into treatment. He said it was fine to ride my young horse as long as it wasn’t making her uncomfortable. So I incorporated COTH advice along with vet’s. I only rode 2x/week and used 1 brush for light grooming only on those days. Cleaned everything that may have touched her daily. Also sprayed down stall walls, water buckets with bleach solution every few days.
Happy to report that at day 17, ringworm looks 95% gone. The first, largest spots near girth have dark skin w/new hair growing and the secondary small spots are gone. I will continue spot treatment til the 3 week mark (or I can no longer find them) and disinfection routine for another 10 days. I may start to add in another riding day as well, and wait another week before I go back to 5 days riding. I washed my hands multiple times and sprayed with alcohol while at the barn, so did not contract it myself. Thank you all!
