Hokey doke, I didn't read it properly the first time!
It's the same thing as collagen necrosis or eosinophillic granuloma - little painless, non-ulcerated lumps that are thought to accur as a reaction to fly bites, but no one really knows. It is really common.
Treatment is using steroids, either injected into the lumps, or sometimes systemically if there are loads. Using fly repelant can help and may stop more from developing.
Hope that's some use. It's nothing to worry about, just a bit unsightly and a pain if they get rubbed by tack.
Thanks GreedyGuts. This is my original post. Since then she's gotten a fair few more
Have spoken to the vet on the phone and he said they sounded like nodular necrobiosis, but probably not to bother doing anything about them.
Do you know how effective steriod treatment is?
It's usually very effective, and they resolve quickly following injection. Systemic steroids could be used, particularly as your horse has multiple lesions, but some vets/owners are wary of this because of the perceived risks.
Sometimes the lumps will recur, but these can usually be treated again with success, and using fly repellents can minimise the risk of this happening. Sometimes large lumps can become calcified and these don't respond to steroids and may need to be surgically excised, but this isn't usually an issue if the lesions are fairly new.
Hi,
One of my heavy cobs has something like this i think the correct term is collagen necrosis/granuloma. They appear out of nowhere and can be quite horrible to look at. In my cobs case they are about the size of 50p and the hair has come off, they are totally painless and do not appear to cause the horse any problems. My vets opinion was to leave them alone, steriods can help but usually he recommends surgery if they start to cause any secondary infection or become painful. It buggs the hell out of me and i have tried loads of things but they are still there. Vet said more of a problem to me than the horse, the only thing is no longer any use for showing. They tend to go flat and the hair comes off, my cob has had them [ 3 in total] for around a year and there is definitely no reaction or unwillingness to tack up or exercise. So i am leaving them alone if or until they do become a problem, which at the moment does not seem likely.
Hope this helps.