Am having a painful pimples on my vagina that comes and goes sometimes it red and sometimes it looks white can you help me please

Considering there was puss that came out, I would say it was an ordinary pimple or even a sebaceous cyst with an ingrown hair under the skin or something similar. The skin down there is more sensitive that skin on other parts and it may hurt more and the problem may look bigger due to the specific place.

Considering that there is hair on the outer labia, they could have easily inflamed and maybe even some bacteria (from skin) got in and caused an infection. I myself get painful pimples down there from time to time but I never freak if there's puss in them.

If you can't put your mind at rest, it would be best you visited dermatologist (not gynecologist). They can have a look and just by looking at it can usually tell with certainty what it is. Immediately you would get a perfect prescription, usually an antibiotic to get rid of an infection. Good luck!

Make an appointment with your OB/GYN. It's possible that this is an STD if you are sexually active.

Yes sounds exactly like a STD, you need to see your doctor, do not have sex with anyone till you verify