Hyperpigmentation is a description, not one diagnosis
Hyperpigmentation means an area looks darker than the skin around it. Friction, shaving, ingrown hairs, follicular inflammation, prior irritation, sun exposure, natural pigment variation and hormonal or metabolic contributors can create a similar appearance through different pathways.
That is why professional treatment starts with the cause. Active rash, infection, significant irritation or an unexplained pigment change may need medical evaluation before cosmetic treatment is considered.

