Could I have a vaginal boil or pimple? Is that possible, because there naturally is no hair in that area?

See a dermatologist. Large inflammatory pustules in the groin can be infectious or an inflammatory response to oil, irritation, sweat, bacteria, fungus, yeast, medications, soaps or other irritating substances. A condition call hidadrenitis is an acne-like condition that presents as inflammatory pustules in the groin. See a dermatologist for consultation.
Hidradenitis. Considered a severe form of acne (acne inversa), hidradenitis suppurativa occurs deep in the skin around oil (sebaceous) glands and hair follicles. The parts of the body affected — the groin and armpits, for example — are also the main locations of apocrine sweat glands.