There are many causes of pimples on the pubic area, and it is important to first identify the cause and then treat it symptomatically. Genital herpes may present with a local burning sensation, clusters of papules, followed by the formation of blisters that break down to form shallow ulcers or vesicles, which can be self-induced painful and last about 2-3 weeks before crusting over and healing on its own. You can use antiviral medication such as acyclovir or ribavirin. It is possible to get a HPV test and a white acetate test to help confirm the diagnosis, and you can use a combination of CO2 laser or liquid nitrogen freezing and antiviral drugs.