More Hair After Laser Removal?What to Bring to a Review

If your hair seems denser after a course intended to reduce it, request a review before booking another package. Paradoxical hypertrichosis is the term used for increased hair growth associated with laser or intense pulsed light (IPL) hair removal.¹ The name describes a reported adverse effect; it does not prove that treatment caused every new hair you notice.

Why “3%” is not your personal forecast

A 2021 systematic review included 9,733 patients across 22 studies, mostly cohort studies. It estimated a pooled prevalence of 3%, with a 95% confidence interval of 1–6%. Variation between studies was very high, with I² of 97%.¹

The review associated the effect with the face or neck; it reported only 0.08% in cases outside those areas. Data were insufficient to determine associations with sex or skin type.¹

Those findings support discussing the possibility during facial-hair treatment. They do not give a precise probability for your chin, skin tone, clinic or home IPL device.

A large clinic reported a different pattern

A 2024 retrospective study² reviewed 7,381 patients treated at one centre between November 2018 and November 2020. It identified 25 cases, or 0.34%, of increased growth compared with baseline. Of those, 24 followed alexandrite treatment. The upper arm was the most common site, followed by the area around the nipple.²

Sun protection and diode “super hair removal” were associated with lower rates in that study.² Because treatment and daily habits were not randomly assigned, those associations cannot establish a prevention method or prove one device universally safer.

The different locations and rates are a reason to ask how a clinic assesses its own patients, rather than treating one published percentage as a guarantee.

Take a record that allows comparison

Ask the clinic to review the original treatment map and photographs with you. If you have your own pictures, use dates and identify whether the change is inside the treated area, beside it or elsewhere.

Prepare four questions:

• What changed? “Do the earlier pictures support increased density or coarseness, and in which areas?”
• What was used? “Can we review the device, treatment settings, session dates and areas treated?”
• What else needs assessment? “Does the timing or pattern suggest another contributor to hair growth?”
• What happens next? “What are the reasons for continuing, changing or stopping this approach, and when will we compare results?”

The AAD recommends asking about the clinician’s experience with your skin colouring, expected results, side effects and whether another treatment would suit you better. It also asks patients to report recent tanning, scarring history and medicines.³ Bring those details even if you supplied them before the first session.

Continuing treatment needs a clinical decision

The review reported gradual improvement with continued therapy in three of four studies that examined that outcome.¹ That limited observation is not an instruction to increase the energy, expand the treatment area or keep using a home device on new growth.

Ask the clinician to explain the proposed next step and the evidence supporting it for your situation. Record what would count as improvement and what would prompt another review.

The “Your Hair Log” section of Hair, Everywhere describes dated photographs in consistent light, distance and angle, including a chin photo, alongside a record of what you started and when. Use that recording method to prepare for the appointment; you do not need to postpone the appointment to accumulate more pictures.