Could it be an interstitial cyst?

Histiocytoma? These are very common. My dog had one on his butt last year - it fell off within a month.

Our 3 1/2 year old labradoodle got a raisin size black cauliflower growth on her ear. We took to our vet and she removed it for $450. it came back a few months later, we left it alone and it just went away on it's own. The vet said it is like warts on humans, and is a virus so nothing can be done?

Anything that does not belong on the skin could be nothing, or it could be serious. Ignoring it is not responsible pet ownership.

Since we are sharing stories: years ago, under my vet's supervision, we kept an eye on a little growth on my cat's paw. When it did not go away, the biopsy showed mast cell cancer (rare in cats), which had mastisized , and might have been better dealt with had it been removed the years before, when we first saw it. This killed her in a few years.

So. I am now all for biopsies and removing things.

At least have the vet stick a needle in it and read the cytology if it is not obvious what the growth is. Some are obvious, some are not.

my great dane girl had a growth between her toes on her left back foot. it was EXACTLY as you describe, it looked just like an engorged tick, almost the size of a marble. had it removed last week and we are waiting for lab test results. my vet said he was 90% sure it was nothing serious but it wasn't supposed to be there and he wanted it removed.

Yes, do have a vet check it. Mine told me about the histiocytoma and told me to leave it alone and let her know if it didn't go away by itself.

gerryc28, how old is Goldie and what breed is she?