I have searched previous threads and found some interesting info, but still no definite for me.
My grey POA mare had a lump on her hiney, in the 'pants' area halfway between top of tail and top of gaskin. It appeared I'm guessing (since I wasn't noticing) maybe 3-4 weeks ago. Was the size of a small grape.
Yesterday it burst into a small bloody mess, and today it's as if a grape has popped out and is hanging there. I tried to pull it but it's still too attached. There is a hole left.
What might I have here? No other lumps or bumps noticed.....yet.....
"As a rule we disbelieve all the facts and theories for which we have no use."- William James
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Sounds like a melanoma. A clients horse here is a roan grey and has lots of melanoma's but the one on her neck almost on the crest so is hidden a bit by her mane will burst open like that every once in a while. Talk to your vet there is several options you can try.
You need to get it biopsied to make sure it isn't a Squamous Cell Carcinoma which is also fairly common in grays and pintos and can definitely fit the description you give. I lost a mare to one a few months ago after having it removed three years ago (it came back despite chemo). Don't fool around with it - make sure you know what you're dealing with.
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