Hello and thank you for asking your question on just answer. My name isXXXXX will try to help.
Do not worry, that is really common. Puppies can get acne just like teenagers. But unlike humans, they do not always get it on their faces. So what you are seeing is most likely a "pimple" or a "zit." To help make it go away faster, you can apply over the counter hydrocortisone cream (for inflammation) and neosporin triple antibiotic ointment (for infection). Apply both three times a day. Neither is toxic if she licks them.
If you want to, you can also apply a warm washcloth, as a hot pack, over the pimple/pustule for 10 minutes three times a day. This will bring the infection to the surface and cause the pimple to "pop" sooner. If you want to skip this part, that is fine as well. The pimple/pustule will pop and drain on its own.
If she gets a large number, all over her abdomen, then she will need oral antibiotics to clear them up. If she has one or two I would not worry.
I hope this helps.