Yesterday I used a roll-on fly repellant on my horse Nirvana. This morning when I went out I saw that, in the shape I rolled the fly repellant on, her skin was swollen and irritated. Her underbelly is also swollen, lumpy and itchy...she broke into hives I think. It is worst here, as her it is just her skin and insects are constantly crowding on the "lumps", some of which are like a baseball in diameter. An allergic reaction I suppose, however I have used this on her some months ago with no problem, maybe her winter coat protected her skin? Anyways, I read a little on the internet on some blogs and horse forums, took their advice and washed her almost all over with a natural soap to get rid of the fly liquid. We are not very close to much here in the country, do you think I should call a vet? Have you ever experienced anything like this? What can I do to relieve the ithching sensation and irritation?