Am I suitable for laser hair removal? Hair colour, skin tone, hormones and medicines

Who is suitable for laser hair removal, and what the assessment looks for

Laser hair removal works by selective photothermolysis: melanin in the hair shaft absorbs the laser energy, the energy becomes heat, and the heat conducts to the follicle. Three things follow. There has to be pigment in the hair, or there is nothing to heat. The melanin in your skin competes for the same energy, so the wavelength has to match your skin tone. And only follicles in their active growth phase respond, so treatment is staged and anything that keeps recruiting new follicles, such as a hormonal drive, changes the plan. The laser hair removal page explains the platform; this page answers whether you qualify.

Dr Sin Yong examines each area separately, because the skin and the hair differ from one to the next: the hair is coarser and the skin darker in the underarm and bikini line than on the arm, and the face is thinner and more reactive than the leg. He looks at hair colour and thickness, assesses skin tone in that area rather than from your face, asks about sun, medicines, hormones and earlier IPL or laser elsewhere, and on darker, recently tanned or reactive skin treats a small test patch first and reviews it before the full area. Suitability is decided area by area, not for the body as a whole.

Hair colour and skin tone: what responds, and which wavelength

Hair colour decides whether there is a target. Dark, coarse terminal hair carries plenty of melanin and responds well. Medium brown hair responds. Blonde, red, white and grey hair carries little or none, and very fine vellus hair, the peach fuzz on the cheeks and forehead, carries so little that treating it is unpredictable and has been linked to paradoxical hypertrichosis, in which fine hair near a treated zone becomes coarser. These hairs are not a risk to treat, but they will not respond, and that is said plainly at assessment rather than discovered afterwards.

Skin tone decides the wavelength, not whether you qualify. The 755 nm alexandrite is strongly absorbed by melanin, which is exactly what you want where dark hair contrasts with lighter skin, Fitzpatrick I to III, and exactly the problem as skin pigment increases. The 1064 nm Nd:YAG is less absorbed by surface melanin and penetrates deeper, so more energy reaches the follicle in Fitzpatrick IV to VI, the range common in Singapore. Having both on one platform means the treatment is matched to you rather than your skin type being called unsuitable; the laser hair removal for dark skin page explains the cooling, test patches and warning signs that go with the longer wavelength.

“Skin tone never makes someone unsuitable; it changes the wavelength. Hair colour and hormones are what decide whether there is anything to treat, and whether it will stay treated.”

Dr Sin YongOn who is suitable for laser hair removal

Hormonal conditions: why the cause is assessed before the hair

Laser reduces the follicles it reaches. It does nothing to the signal that recruits new ones. In some women, coarse hair on the chin, jawline, upper lip or lower abdomen is driven by androgens, and polycystic ovary syndrome is the commonest reason. If that drive continues, new follicles can be recruited over time, so hair returning later is not a failure of the earlier treatment; it is the condition continuing. The honest plan treats both, and the Endocrine Society guideline on hirsutism recommends that the cause is evaluated, particularly where hair is new, rapidly increasing or accompanied by irregular periods, adult acne or scalp thinning.

So new or rapidly increasing facial or body hair in a woman is assessed for its cause before treatment, and where a hormonal condition is suspected the plan is made alongside her doctor's management of it rather than instead of it. Changes around pregnancy and the menopause also alter hair growth, which is one reason pregnancy is a time to wait and why occasional maintenance is discussed at assessment rather than ruled out. The facial laser hair removal page covers the chin and upper lip in detail.

Tanning, isotretinoin and other medicines: who should wait

Most reasons to say no are temporary. Recently tanned, sunburnt or self-tanned skin is not treated until it settles, because the extra pigment in the surface absorbs energy meant for the follicle and shifts the balance toward epidermal injury; self-tanning product is removed, and deliberate sun exposure is avoided between treatments. Active infection, a cold sore, inflamed folliculitis, eczema or broken skin in the area is treated first. Pregnancy is a reason to wait, as hair growth often changes afterwards and treatment in pregnancy has not been studied. Waxing, plucking or epilating removes the hair shaft the laser needs, so the area is shaved instead before a visit.

Medicines and history matter. Photosensitising drugs are discussed before any pulse is fired. Isotretinoin deserves its own line: older guidance advised a long gap after a course before any laser, and a 2017 systematic review with consensus recommendations found no evidence to support delaying non-ablative laser hair removal on that basis; even so, Dr Sin Yong discusses recent isotretinoin individually, looks at how the skin is healing, and may use a test patch rather than treat the whole area. Vitiligo, a keloid tendency and pigment change after earlier laser or IPL call for caution or a different plan. A tattoo, cosmetic tattoo or dark mole in the field is avoided, and a changing mole is checked before anything else. The full list, and what recovery looks like, is on the laser hair removal aftercare page.

Who should wait or is not treated

• Recently tanned, sunburnt or self-tanned skin: wait until settled
• Pregnancy: deferred
• Infection, cold sore, folliculitis, eczema or broken skin in the area: treated first
• Photosensitising medicines or recent isotretinoin: discussed, test patch where in doubt
• Vitiligo, keloid tendency or pigment change after earlier laser or IPL: caution or a different plan
• Tattoos, cosmetic tattooing or dark moles in the field: avoided

What decides the plan, if you are suitable

Fees are not advertised, and a figure before examination would not describe your hair or your skin. What shapes the plan is the areas treated and their size, the wavelength and settings each one needs, whether a test patch is planned, how treatment is staged across the hair cycle, and whether anything else, such as a hormonal assessment or treatment of ingrown hairs, sits alongside. The how we quote page explains what the written plan contains, and the how many sessions page explains what decides the length of a course without pretending to a number.

If you are suitable, the area is shaved, eye protection is worn, the cooled tip protects the surface while energy reaches the follicle, and redness and small raised bumps around the follicles follow and settle on their own. Treated hairs can seem to keep growing for a short while before they shed; that is the hair leaving the follicle, not regrowth. If an area is not suitable, the plan says so, and the hair removal guides list the area and skin-type pages that may still apply to another part of the body.