A few months ago I purchased a mare that had rain rot. I tried a few different methods to get rid of it, but nothing worked. My vet suggested Shapley's Original M-T-G. This worked well, but because it was oil based she sunburned easily. Once the cooler months came it all cleared up. Here is my dilemma, she gave birth in Sept, and the colt soon got the rain rot before I got the mare's cleared up. I treated him as well as I could considering he wasn't people friendly at first. I am able to be more "hands-on" with him now and I have noticed his rain rot has not only increased but the size of the scabs are considerably large. I am weaning him Friday so he will be stalled for a bit, which I thought would be a great time to treat his rain rot more intensely. My question is, should I continue using the Shapley's that I used on my mare, or should I go ahead and call the vet out and see if he needs treated through medication? I am a full-time student so I have to pinch pennies where I can, but I won't hesitate to call the vet if need be.
Thank you ahead of time.