IPL (Intense Pulsed Light)
IPL, or intense pulsed light, uses broad-spectrum flashes of light to target colour (pigment) in the skin. Unlike a laser, which uses a single wavelength, IPL delivers a range of wavelengths, which is why the same device can be used for different concerns. It is most commonly used for hair reduction and for skin rejuvenation, helping to soften sun spots, freckles, facial redness, thread veins and the flushing linked to rosacea. The light is absorbed and converted to heat, which disables the hair follicle or breaks down unwanted pigment. Because IPL works on contrast between the target and the surrounding skin, it tends to suit people with lighter skin and darker hair or clearly defined pigment, and it is generally less suitable, and higher risk, for darker or tanned skin, where the light can be absorbed by the skin itself and cause burns or pigment changes. IPL is not a single fixed treatment. A trained practitioner tailors the settings, wavelength filter and energy to your skin tone, the concern being treated and how your skin responds, and a course of sessions is usually needed rather than a one-off. Results build gradually and are best thought of as reduction and improvement rather than permanent removal or a cure.
Book a face-to-face consultation before your first session so the practitioner can assess your skin tone (Fitzpatrick type), review your medical history and carry out a patch test. Avoid sun exposure, sunbeds and fake tan for at least four weeks beforehand, as tanned or recently exposed skin significantly raises the risk of burns and pigment changes; treatment is usually postponed if your skin is tanned. Do not pluck, wax, thread or use epilators for around four to six weeks before hair-removal sessions, because IPL needs the hair root in place, though you can shave. Stop retinoids, strong acids and other exfoliating actives for several days as advised, and tell your practitioner about any medicines or supplements that increase light sensitivity. Come to your appointment with clean skin, free of make-up, moisturiser, deodorant or perfume on the treatment area. If you have any doubts about a medicine or skin condition, check with your GP or prescriber first.
You will usually be asked to confirm there have been no changes to your health, medicines or sun exposure since your consultation. The area is cleansed and often a cool gel is applied, and both you and the practitioner wear protective eyewear, as IPL light can damage the eyes. A handpiece is placed against the skin and delivers pulses of light, typically felt as a warm flick or the snap of an elastic band, with a burst of brightness through the goggles. The practitioner works methodically across the area, checking your skin's reaction as they go and adjusting the energy if needed. A small area such as the upper lip may take only a few minutes, while larger areas or full-face rejuvenation can take twenty to forty-five minutes. Afterwards the skin is cooled and soothed. For pigmentation, treated spots may look darker at first before flaking away over the following days.
Expect the treated skin to feel warm and look pink for a few hours, similar to mild sunburn. Cool the area gently and apply any soothing product your practitioner recommends; avoid rubbing, picking or scratching. For at least a week or two, keep away from heat that raises the skin's temperature, including hot baths and showers, saunas, steam rooms, swimming pools, intense exercise and very hot drinks against the skin. Do not use perfumed products, exfoliating acids, retinoids or make-up on the area until any redness has settled. Where pigment has been treated, let the darkened spots and crusts flake off naturally rather than scrubbing them. Protect the area from the sun completely and use a high-factor broad-spectrum SPF every day, as skin is more vulnerable to pigment changes afterwards. Follow the interval your practitioner advises between sessions, and contact them promptly if you notice blistering, unusual pain or signs of infection.
IPL is an energy-based device treatment, so the biggest safety factors are the practitioner's competence and the settings they use. Choose someone properly trained and qualified in IPL specifically, insured for it and working in a clean, professional setting with well-maintained, calibrated equipment. The most common problems reported are burns, so correct energy settings matched to your skin tone, together with an honest assessment of whether IPL suits you at all, are essential. Accurate Fitzpatrick skin typing, protective eyewear for everyone in the room, and a fresh patch test whenever the area, device head or settings change all reduce risk. IPL is generally higher risk on darker or tanned skin, where burns and pigment changes are more likely, and a good practitioner will decline or adapt treatment rather than press ahead. In some parts of the UK, such as London and parts of Wales and Scotland, laser and IPL premises must be registered or licensed with the local authority, so it is reasonable to ask about this.
IPL is not suitable for everyone, so a full medical history matters. It is generally avoided in pregnancy, on tanned or very dark skin, and over moles, undiagnosed lesions, tattoos or areas of active infection, eczema, psoriasis or cold sores. Several medicines and conditions increase light sensitivity or the risk of pigment problems, including recent isotretinoin (Roaccutane), certain antibiotics, St John's Wort, some acne and photosensitising medications, and conditions such as epilepsy triggered by light or a history of keloid scarring. IPL can worsen melasma and may activate cold sores or other latent infections. If you have a history of skin cancer, a bleeding disorder, are taking blood thinners, or have any concern that has not been checked, speak to your GP or a suitably qualified medical practitioner before booking. IPL is a cosmetic treatment, not a medical diagnosis or cure, and any new, changing or suspicious skin lesion should be assessed by a doctor rather than treated.
Yes. A patch test on a small area of the intended site is standard good practice for IPL and should be done at consultation, usually at least 24 to 48 hours before your first full session. It checks how your skin reacts to the light and energy and helps the practitioner set a safe starting point, reducing the risk of burns and pigment changes. A fresh patch test is also sensible whenever you move to a new body area, or the device, headpiece or settings change, as reactions can differ. A patch test is not a guarantee, and sensitivity can still vary with sun exposure, medicines or hormonal changes, so honest disclosure at every visit matters. From a UK liability point of view, skipping the patch test and consultation can leave a practitioner exposed if a claim arises, which is why reputable providers insist on it.
Be cautious if a provider skips the consultation, medical history or patch test, or is willing to treat tanned skin or press ahead on darker skin without discussing the higher burn and pigment risks. Vague answers about their IPL training, qualifications or insurance, or reluctance to say what device and settings they use, are warning signs, as is equipment that looks poorly maintained or is not calibrated. No protective eyewear, no cooling, or a practitioner who cannot explain contraindications should give you pause. Promises of permanent removal, guaranteed results, or a cure for a skin condition are not credible. High-pressure sales, discounts for booking a big course on the spot, and dismissing your questions about medicines or skin conditions are all reasons to walk away.
Good practice looks like a thorough face-to-face consultation, accurate skin typing, a documented medical history and a patch test before treatment. A trustworthy practitioner is specifically trained and qualified in IPL, insured for it, and happy to show evidence and explain the device, wavelength filter and settings they will use and why. They give protective eyewear to everyone in the room, keep clean and calibrated equipment, and record your settings and reactions each visit. They are honest about whether IPL suits your skin, set realistic expectations of gradual improvement over a course, and will decline or adapt treatment where risk is high rather than simply taking your money. Clear written aftercare, sensible session spacing, and awareness of any local authority registration requirements are further signs of a careful, professional service.
- What are your specific qualifications and training in IPL, and are you insured for this treatment?
- Is IPL suitable for my skin tone and the concern I want treated, and what are the realistic results?
- Which device do you use, and how will you choose and record the settings for my skin?
- Will you do a patch test and full consultation before my first session, and how far in advance?
- What are the risks of burns or pigment changes for me, and how do you reduce them?
- How many sessions am I likely to need, what is the total cost, and what aftercare do you recommend?
Most people describe IPL as a series of warm flicks or the snap of an elastic band against the skin, along with a bright flash of light seen through the protective goggles. The cooling gel and any chilled tip help take the edge off the heat. Bonier areas, thinner skin and denser or darker hair can feel sharper, while lower-energy settings feel milder. Sensitivity often varies with the area treated and, for some people, with the time of the month. Straight after treatment the skin usually feels hot and tight, much like mild sunburn, easing over the next few hours. Sharp, intense pain during a pulse is not normal and should be mentioned straight away, as it may mean the settings need adjusting.
IPL typically involves little downtime, and most people return to normal activities the same day. Redness and warmth usually settle within a few hours to a couple of days. For skin and pigmentation work, treated spots often darken and then flake over roughly one to two weeks, and some mild swelling can occur around the eyes or on delicate areas. Because a course is usually needed, sessions are commonly spaced a few weeks apart. Sun protection and heat avoidance during this period matter, as the skin is temporarily more reactive. Any blistering, prolonged redness or pigment change should be discussed with your practitioner.
IPL results build gradually rather than appearing overnight, and a course of sessions is usually needed. For hair, several treatments spaced a few weeks apart are typical, aiming for reduction and finer, sparser regrowth rather than guaranteed permanent removal; top-up sessions are often needed over time as some follicles recover, and hormonal changes can prompt new growth. For pigmentation and redness, spots may darken and flake before the skin looks clearer and more even, with maintenance sessions every several months to a year depending on your skin and sun habits. Daily broad-spectrum SPF and sensible sun avoidance protect your results and reduce the chance of pigment returning. Because IPL is tailored to your skin and response, your practitioner should review progress and adjust the plan as you go. Realistic, individual expectations and consistent aftercare give the best long-term outcome.