To put pictures on here scroll up the page when you repley theres a manage attachments click on that. Then from there click browser botton I have pics stored in my computer so I just go to where there stored. Then click on the picture I want then click upload. And the picture is loaded on your thread. Don't know if I made sense but I tryed if not let me know.
Not sure if pics are really going to help but they might sounds like it could be a fly spray problem. But iam not real sure either if its oil based that could be it. Hard to tell with out seeing the horse in person but ill try to figure it out some how.