What should you know about hypertrichosis genetics?

Inherited hypertrichosis may follow a pattern within a family, start in childhood, and affect a defined distribution or broader body areas. A family member can have a different degree or pattern. A person may also develop hypertrichosis because of a medicine, a health condition, or an unexplained change, so the absence of affected relatives does not rule out the diagnosis.

A clinician asks when the growth began, whether it was present at birth, which relatives are affected, and whether other physical changes occurred. Genetic testing is not automatically needed and is considered in selected situations.

Write down the age at onset, body areas involved, medicines and supplements, and any changes over time. Ask relatives about similar hair growth without assuming that a shared trait proves a diagnosis. A dermatology assessment can distinguish a stable inherited pattern from new growth that warrants medical evaluation. For appearance, laser hair removal or electrolysis can be discussed after skin and hair characteristics are reviewed.

Seek assessment for sudden or rapidly increasing hair, a new localized patch with a changing mole or lump, or associated symptoms such as weakness, unexplained weight change, voice deepening, or menstrual disruption. A longstanding stable family pattern may be less urgent, but it still merits review if the diagnosis has never been confirmed.

Does my pattern suggest inherited hypertrichosis or another cause? Would genetic counselling or testing change my care? Which relatives’ history would be useful? Should I have any medical tests before choosing hair removal?