Lump on right side of puppys neck

I have a six month old male golden retriever. He has had regular vet checks, vaccinations, and gets heart guard and frontline plus monthly. He is very active and appears happy and healthy with a great appetite.

About three days ago i noticed a lump on the right side of his neck--about the size of a silver dollar. The lump is under the skin and will move with manipulation and when he runs. This does not bother him or seem to cause any discomfort at all. At first i thought he nay have been bitten by a spider but could not see any marks or redness at the site of the lump. I decided to watch it for a few days but it has not decreased in size.


What could this be?








Hi
I think the most likely possibilities are something like a reaction to a bite/sting that has occurred under the skin, or a simple sebaceous cyst.

Although there would normally be some reddening of the skin at the site of a bite or sting, it's not always there.

Sebaceous cysts are basically lumps of fatty cells that collect in one place and aren't malignant. They're fairly common and can come up overnight almost, stay around for a while and then disappear rapidly.

However, I'd recommend that you have your vet check out your puppy to make sure that it's something simple like this and not a swollen lymph node, infection or anything that needs treatment.

Hope this helps, best of luck with your puppy.