What is the cause of skin colored moles on my vaginal area?

Genetics and fate: New moles appear on people as they age. Even children get new moles. Some moles are worrisome, so a doctor can look for, examine, and maybe biopsy such moles. Concerning signs are: asymmetry (one half of the mole growing faster than the other half), border irregular, more than 1 color in the mole, diameter more than 6mm, and the mole is elevated above the surrounding skin. Warts are another story.