Clinical guide

IPL on Fitzpatrick IV to VI: The Conservative Protocol

IPL on Fitzpatrick IV to VI is workable, but only when three dials move together: a longer cut-off filter, a lower energy window, and cooling that never stops. Epidermal melanin sits directly in the beam path and absorbs light meant for the follicle or the lesion beneath it. This guide covers the settings logic, a test spot protocol you can run this week, and the cases where turning the booking away is the right call.

Why darker skin is the highest-risk IPL consultation

Margin for error shrinks as phototype climbs. A type II client with coarse dark hair forgives a lot: set the energy slightly high and you get redness gone by dinner. By type V the cushion is gone.

Awkward, then, that so much hair removal demand sits where a broadband lamp is hardest to run safely. At a demo, ask how finely the machine comes down, not how high it goes.

Why epidermal melanin competes for every pulse on Fitzpatrick IV to VI

Anderson and Parrish laid the rule down in Science in 1983: heat a target that absorbs better than its surroundings, keep the pulse short, and it coagulates while the neighbours survive. Hair removal aims at melanin. So does most pigment work.

That's the problem. The melanin you want sits in the follicle or the lesion. The rest is spread through the basal layer, in the beam path, and it absorbs first. Our engineering archive is blunt: below 800 nm any wavelength preferentially heats melanin, and such light scatters readily inside the epidermis. Fayne and colleagues, reviewing types IV to VI in the American Journal of Clinical Dermatology, name longer wavelengths as a key element of the protocol.

One worked example from the archive belongs above every console. At a given fluence, a pigmented follicle coagulates progressively at roughly a 100 ms pulse. The same fluence damages the epidermis at about 99 ms. One per cent of margin. Epidermal protection has to be hardware, not a setting.

Four IPL settings for Fitzpatrick IV to VI: filter, fluence, pulse structure, cooling

On darker phototypes all four dials point one way: longer, lower, colder.

Cut-off filter. Hair removal takes a longer-wavelength filter because the target sits deep, says our engineering archive, and darker skin takes a longer cut-off still to protect the epidermis. Breadon and Barnes reached the same place from the adverse-event side: longer wavelengths mean epidermal melanin absorbs less energy. Our manuals for the MF-05 E-Light IPL and RF platform list SR 530-1200 nm, VR 585-1200 nm and HR 610-1200 nm, hair removal on the 610 nm cut-off.

Fluence. Come down further than instinct suggests. Our diode parameter sheet shows the shape: underarm hair removal at 808 nm opens at 10 J for types I to II, 8 J for III to IV, 5 J for type V. Same anatomy, half the energy.

Pulse structure. Two rules from our archive: a wider pulse acts more gently on tissue and stimulates the epidermis less, and a wider pulse interval improves how well skin buffers and sheds accumulated heat. StatPearls says the same for laser hair removal on darker skin, lower fluences and longer pulse durations. Both describe the exposure tissue actually receives, and a lamp firing a train of sub-pulses won't hand you that as one number. Which is why the table below needs reading twice.

Cooling. Our archive defines epidermal cooling as suppression of thermal coagulation in the epidermis, and as what makes high fluence to a deep target possible at all. Sapphire contact cooling at the output window protects continuously across the shot. One exception: when the target is pigment inside the epidermis, skip immediate cooling or you chill the target too.

Below is the hair removal block of our own E-Light parameter sheet, headed Hair removal (four limbs, hair on the face, armpit hair, pubes). It spells out all five energy windows individually, and prints the type VI row empty. Nothing here is interpolated by us. The column names are the sheet's own.

Fitzpatrick	Sub-pulse count	1st-pulse width	Sub-pulse width	1st-pulse delay	Console energy
I	8-10	7.0-10.0 ms	No wider than 1st pulse	1 ms	38-50 J
II	8-10	5.0-10.0 ms	No wider than 1st pulse	1 ms	38-48 J
III	6-8	4.0-8.0 ms	No wider than 1st pulse	1 ms	36-46 J
IV	5-8	3.5-5.0 ms	No wider than 1st pulse	1-3 ms	35-42 J
V	4-7	3.0-3.6 ms	No wider than 1st pulse	3-5 ms	28-38 J
VI	Blank on sheet	Blank on sheet	Blank on sheet	Blank on sheet	Blank on sheet

Read the pulse-width column as its header names it: the width of the first sub-pulse in the train, not the exposure the skin sees overall. Sub-pulse width isn't a number on that sheet at all, it's a rule, every later sub-pulse held to no wider than the first. So lowering the first pulse lowers the ceiling for the whole train. Our archive also states that first-pulse energy acts mainly on superficial pigment and vessels in the epidermis and papillary dermis. Precisely the layer you're trying not to cook.

The reconciliation in one sentence: the first sub-pulse is the epidermal-loading pulse, so shortening it while the delay behind it stretches from 1 ms to 3-5 ms, sub-pulse gaps widening the same way, hands the skin smaller instalments with more time to shed heat between them. Longer, lower, colder, written in a different column. Taken alone the column reads as "shorter pulses for darker skin", and that reading is wrong. The sheet tells you to work from the initial number and adjust to the patient's reaction, so every row is a starting point, not a recipe.

The bottom row: our sheet prints type VI and publishes nothing against it. No count, no width, no delay, no energy window. Our IPL clinical guide separately lists very dark skin as a contraindication. Any type VI treatment is off-sheet clinical judgement carrying risk the sheet declines to underwrite, and nothing in the type V row extrapolates downward into it. A clinic that proceeds anyway does so on its own responsibility, with the longest cut-off the platform offers, uninterrupted cooling, a staged test spot read out to a full two weeks, an experienced operator, and written consent naming post-inflammatory hyperpigmentation and possibly permanent hypopigmentation.

A test spot protocol for darker phototypes you can actually run

Telling staff to run a patch test is not a protocol. This is.

Test in the area you'll treat, on skin of the same hair density and colour. An inner arm says nothing about a jawline.
Place three well-spaced, marked shots. Start below the sheet's opening value for that phototype, then step up.
Photograph under fixed lighting with a colour reference in frame. Same setup at every read.
Read at fifteen minutes. Our diode manual gives the endpoint as small papules around the follicle, skin red and warm. Greying, blanching or a blister means stop and drop the settings.
Read again at 24 to 72 hours. Our IPL clinical guide places test spots within three days of the session for exactly this.
Types V and VI need longer. Pigment change often declares itself a week or two out, well after a clean 72-hour read.

Now the caveat nobody selling equipment likes printing. Garcia and colleagues, treating types IV to VI with a long-pulsed alexandrite across 550 sites, saw complications in only 2 per cent of cases but found prelaser skin testing unhelpful, with no relationship between skin reaction and complications. A test spot lowers risk. It doesn't license aggression afterwards.

Contraindications, deferrals, and when the honest answer is no

Recent sun exposure. Our IPL clinical guide lists unprotected sun or solarium use within four weeks as a contraindication, with recent sunburn. A fresh tan is extra epidermal melanin in the beam path. Rebook.
Self-tan. Off for one to two weeks beforehand. Clients don't think of it as a product.
Waxing and plucking. Four weeks clear. Shaving is fine, and required on the day.
Medication and history. Isotretinoin in the last six months, active infection, herpes in the treatment field, pregnancy, seizure history, severe dermatitis or eczema in the area, photosensitising drugs.
Any pigmented lesion you can't confidently identify. Refer for diagnosis, with biopsy where indicated, before light goes near it. Treating an undiagnosed lesion destroys the evidence.
Fitzpatrick VI. Our IPL clinical guide lists very dark skin as a contraindication, and our parameter sheet publishes no energy window for type VI. Any type VI treatment is off-sheet clinical judgement carrying risk the sheet declines to underwrite. Same position as the settings section above: a clinic that proceeds anyway does so on its own responsibility, with the longest cut-off the platform offers, uninterrupted cooling, a staged test spot read out to a full two weeks, an experienced operator, and written consent naming post-inflammatory hyperpigmentation and possibly permanent hypopigmentation.

Then the platform question, which is really a purchasing question. Chan and Dover, in the Journal of Drugs in Dermatology, concluded that with the right settings darkly pigmented individuals can undergo laser hair removal effectively with the long-pulsed 1064 nm Nd:YAG, and the Fayne review lists Nd:YAG among the safer options for types IV to VI. Broadband IPL is not that.

A single-wavelength diode is the pragmatic middle ground. Our DL-07 808 nm diode laser hair removal system drops the broadband tail and runs one wavelength against a per-phototype start table, a smaller thing to get wrong than a filtered lamp. Our hair removal solutions overview shows how modality choice plays out across skin types. Where the complaint is dyschromia rather than hair, light can worsen melasma, and our pigment removal solutions page sets out which device belongs on which lesion.

PIH, aftercare and the paperwork that protects you

Post-inflammatory hyperpigmentation is the complication you'll actually meet. Davis and Callender, reviewing PIH in skin of colour, note that injury from irritants, burns or cosmetic procedures triggers it, that photoprotection is integral to treatment, and that epidermal hypermelanosis may take months to years to resolve untreated, while dermal pigment can be permanent. Our IPL clinical guide adds that dark and white patches alike can last two weeks to a year, the white ones potentially permanent.

Aftercare isn't a leaflet handed over on the way out. Daily broad-spectrum sunscreen, SPF 30 or above. No exfoliation for a week, no very hot water for two days, no picking at blisters or crusting. If pigment appears, get the client back early.

Documentation is your commercial defence. Record the phototype assessment, the test spot settings and photographs, then filter, energy, pulse structure, cooling and machine serial every session. Consent should name post-inflammatory hyperpigmentation and hypopigmentation in plain words, and say clearance takes a course of sessions with no guaranteed endpoint. A client told in writing that a light patch may be permanent is a different conversation.

This page is educational material for equipment buyers and operators. It isn't medical advice and doesn't replace a clinician's assessment of an individual patient.

Frequently asked questions

Can IPL be used on Fitzpatrick VI at all?

Our position is identical everywhere this page states it. Our IPL clinical guide lists very dark skin as a contraindication, and our parameter sheet publishes no energy window for type VI, so any type VI treatment is off-sheet clinical judgement carrying risk the sheet declines to underwrite. A clinic that proceeds does so on its own responsibility, with the longest cut-off the platform offers, uninterrupted cooling, a staged test spot read out to a full two weeks, an experienced operator, and written consent naming post-inflammatory hyperpigmentation and possibly permanent hypopigmentation. No energy figure exists for that row, and none should be inferred from type V.

Why do the sheet's pulse widths shorten as phototype climbs?

Because that column is the first sub-pulse only, and our archive says first-pulse energy lands mainly on superficial pigment and vessels in the epidermis and papillary dermis. Shorten it and every later sub-pulse comes down too, since the sheet holds them to no wider than the first. Pair that with delays stretching from 1 ms to 3-5 ms and the epidermis takes smaller doses with longer recovery gaps.

How long between the test spot and the first full session?

Our clinical guide places test spots within three days of treatment, which works for types I to IV. Higher phototypes need more patience. Pigment change often surfaces seven to fourteen days later, so a clean 72-hour read can mislead you. A fortnight costs one booking slot. Getting it wrong costs a face.

Can I copy energy settings from another manufacturer's sheet?

No, and this is a genuine burn risk. The energy figure on an IPL console is a machine power setting, not a measured fluence at the skin. Two platforms both reading 35 J can deliver very different doses depending on lamp, light guide, filter and window area. Use the numbers written for your machine.

Evidence & further reading

Educational material for equipment selection and operator training. It is not medical advice, a treatment protocol or a promise of clinical outcome.

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