Hello and thanks for trusting me to help you. I am a board certified consultant with over 30 years of experience.
The pimple you describe can be due to folliculitis.
You may have a bacterial infection of the follicles.(folliculitis).
Folliculitis starts when hair follicles are damaged by friction from shaving.
Bacteria often enter through a small opening of a hair follicle.
Folliculitis is usually caused by staphylococcus aureus. Heat and sweat can aggravate folliculitis.
Folliculitis is treated with topical antibiotics .
Warm, moist compresses may promote drainage of the affected follicles. Treatment may include antibiotics applied to the skin (mupirocin)
Other possibility include Bartholin Cyst.
The Bartholin's glands are located on each side of the vaginal opening. These glands secrete fluid that helps lubricate the vagina.
Sometimes the openings of these glands become obstructed, causing fluid to back up into the gland. The result is relatively painless swelling called a Bartholin's cyst. If the fluid within the cyst becomes infected, you may develop a collection of pus surrounded by inflamed tissue (abscess).
Treatment may include
Sitz baths with KMNo4 or betadine
Since you describe that it is multiplying suggest that it is contagious and you may require prescription antibiotics to cure the infection.
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