Hi there, this is Dr. Elaine. May I gather a bit more info for clarity?
This is not on the tooth itself, only the gums?
Is it raised or is it just black color?
Is there any black pigment elsewhere in her mouth?
Are the teeth loose in front or heavily encrusted? Odor?
This sounds like pigmentation to me--especially if she has similar areas elsewhere on the gum tissue.
This is very common, and can increase in number/spots with age. Because you report these as brand new, it is safest to have them checked, otherwise now that you have noticed them, keeping a closer eye will be easier.
This isn't exactly a spot most of us spend a lot of quality time in, unless brushing their teeth
Attachments are only available to registered users.
The worst thing would be melanoma, which is why I say either have it checked for you own peace of mind, or watch very closely. However, this is highly unlikely.