I Go to the ranch today to see my horse who hase these 3 Pretty good size swellings. They are atleast 7 by 5 inches wide. If anybody knows if this can be an allergic reaction,or any advice at all about this it would be much appreciated.I am a new horse owner of only 1 year and my horse has never had this problem. Any suggestions or comments would be helpful!! Just trying to figure this thing out.