Ingrown hairs might appear to be pimples, but that description is more akin to a possible symptom of ingrown hairs rather than an accurate definition. What ingrown hairs are, in fact, are hairs that, in the process of growing, curl downwards to the point where they grow back into your skin.
Ingrown hairs are more likely than not to occur post-puberty, and they tend to show up in areas of the body where the hair is coarse — namely the bikini region for women as well as the face and neck regions for men.