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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
Are you able to send a picture of the lump? Do you ever see any discharge associated with it?
Does he have any other lumps that you have noticed?
Ok great. It could be in the region of his first nipple, however if this was the case, I would expect him to have the same thing on the other side.
This lump could be a number of things:
It may be a residual swelling as a result of an insect bite or sting. Small areas of scarring can occur in response to trauma such as a sting and these lumps can be of no concern.
Young dogs can get a skin growth called a histiocytoma which is a benign growth that should spontaneously regress without treatment.
The other possibility is that the lump could potentially be a mast cell tumor. These are the great pretender and can have an appearance like many other masses. The only way to know for sure would be with a needle biopsy to assess the lump.
If the lump is changing in size, is bothering him, ulcerating or persisting, I would generally advise having it checked out by your vet.
Apologies for the delay in replying, I have been offline for a few days.
I agree, it does not appear to be a nipple. I think the most likely situation is a lump as a result of an insect bites such as a tick. However if it is not resolving a needle biopsy would be useful to diagnose further.