Need dog help (what is this thing?)

[RandomHero]

some of us are rednecks and do our own work on the dogs. any idea what this could be??

Saw this a few days ago on my dogs "underarm" area, figured it was a bug bite or something and it would subside. at the worst i thought it was a pimple. anyway, today i noticed it is still the same as it was a few days ago. i took a needle to it and lanced it, but nothing came out, just a little blood when i squeezed it. any idea on what it could be?

 

[Waterguy]

It looks to be a type of tummer. If its an older dog that's more than likely what it is.
My dag is aroun ten and similar markings. The vet told me it was a type of tummer dogs get as they get older.

 

[RandomHero]

shes like 2. it just showed up this week

 

[556.45.12]

A tick? An inflamed nipple?

 

[proforguns]

I'm a dog groomer have been for the last 16 years,hard to say from the picture might be a tumor or a wart or just a growth.P.M. me if you want to bring him by my shop I can take a closer look but I wouldn't poke on it anymore.