Ingrown hairs and razor bumps: what helps permanently
Ingrown hairs, razor bumps and strawberry legs share the same root: a hair that does not grow freely out of the skin after shaving, waxing or epilating. Here you will find out why hairs become ingrown, what distinguishes pseudofolliculitis from folliculitis, what exfoliants can do and why laser hair removal tackles the cause.
The answers deal with the bikini line, legs, beard and neck, with curly hair and dark skin, and with how to handle inflamed areas before the appointment. The devices we name are the DEWEON 4LD diode laser and the AlexDUAL UFO with alexandrite and Nd:YAG lasers from SIACSKIN.
Why do hairs become ingrown and who is most often affected?
A hair becomes ingrown when its tip cannot find its way out of the follicle or curls back into the skin after emerging. The body then treats it as a foreign body: a red, often itchy bump develops. People with coarse, curly hair are affected particularly often because the hair already grows curved inside the follicle. Dry, heavily keratinised skin, hormonally induced dense hair growth, tight clothing and frequent, very close shaving also increase the risk. Typical areas are the beard and neck, underarms, bikini line and legs.
The skin only settles permanently when fewer and finer hairs grow back. This is achieved by lasers such as the DEWEON 4LD and the AlexDUAL UFO from SIACSKIN, which heat the follicle via the pigment in the hair.
What are razor bumps (pseudofolliculitis barbae) and how do they develop?
Razor bumps are small inflamed papules that develop when freshly shaved hairs grow back into the skin. The technical term pseudofolliculitis says what lies behind it: it looks like an infection of the hair follicle but is a foreign body reaction to the person's own hair. Either the hair curves back into the skin after emerging, or the sharp tip pierces the follicle wall while still beneath the surface. Close shaves against the grain and with the skin stretched encourage this, because the hair then ends below skin level.
As long as shaving continues, the problem returns. Laser hair removal with the DEWEON 4LD or the AlexDUAL UFO reduces the number and thickness of the hairs growing back and so removes the basis for razor bumps.
What is the difference between an ingrown hair and folliculitis?
With an ingrown hair, the hair itself irritates the skin; with folliculitis, the hair follicle is inflamed by microorganisms, usually bacteria, less often yeasts. You can often recognise an ingrown hair as a dark dot or loop beneath the skin, and the bump is solitary. Folliculitis shows many similar pustules with a yellow head, typically after a hot tub, heavy sweating or shaving with a blunt blade. The two can occur together, because scratched areas easily become infected. If the inflammation spreads or keeps recurring, a doctor should clarify the cause.
For laser hair removal the difference matters: ingrown hairs improve with treatment using the DEWEON 4LD or the AlexDUAL UFO, whereas an acute infection must heal first.
What are strawberry legs and what helps against them permanently?
Strawberry legs are dark dots on the lower legs that resemble the seeds of a strawberry, and they sit exactly at the hair follicles. What you usually see is the dark hair lying just beneath the skin surface after shaving, together with sebum and keratin plugs in enlarged follicle openings. With dry skin or a keratinisation disorder (keratosis pilaris), rough bumps appear as well. Exfoliation and moisturising care smooth the surface, but the dots remain as long as there is a coarse hair in every follicle.
This is where laser hair removal comes in: if no dark hair grows back in the follicle, the dot usually disappears too. The DEWEON 4LD is suitable for legs, with spots of up to 15 × 40 mm and a repetition rate of up to 30 Hz, so large areas are treated quickly.
Why do people with curly hair and dark skin get razor bumps more often?
Because tightly curled hair grows in a curved follicle and, after shaving, almost inevitably arcs back towards the skin. In men with tightly curled beard hair, pseudofolliculitis is therefore one of the most common skin problems. Darker skin also responds to any inflammation with dark marks that remain visible for longer than the bump itself. Laser hair removal is particularly helpful here but requires the appropriate wavelength, because the melanin in the epidermis also absorbs light.
For skin types V to VI, the Nd:YAG laser at 1064 nm is the safe choice; in the AlexDUAL UFO it works alongside the alexandrite laser. With 755, 808, 940 and 1064 nm, the DEWEON 4LD likewise covers all skin types.
Why do ingrown hairs keep coming back after shaving, waxing and epilating?
Because all three methods remove the hair only temporarily, and the follicle then produces a new hair that has to pass through the skin again. Shaving leaves a sharp tip just below or above the surface. Waxing, sugaring and epilators pull the hair out together with the root. The regrowing hair is initially thin and soft and gets trapped more easily beneath a horny layer. Depilatory cream spares the tip but frequently irritates the skin.
The laser breaks this cycle because it acts on the follicle itself: the hair grows back finer or not at all. With the DEWEON 4LD and the AlexDUAL UFO you achieve long-term, marked hair reduction. Individual hairs may grow back, but they are usually thinner and become ingrown less often.
After how many laser sessions do ingrown hairs and razor bumps decrease?
Many people notice after just 2 to 3 sessions that markedly fewer hairs become ingrown and the skin becomes calmer. Even the first treatments hit the coarsest hairs, and what grows back is thinner and softer and curls into the skin less often. For a stable result, the full course of usually 6 to 8 sessions is nevertheless needed, every 4 to 6 weeks on the face and every 6 to 10 weeks on the body, because the laser only affects hairs in the growth phase. Dark marks from old inflammation fade more slowly, often over several months.
With the DEWEON 4LD, the client management system records treated areas and shot counts, so progress can be tracked from session to session.
Why do hairs become ingrown so often along the bikini line and in the underarms?
Because everything that promotes ingrowth comes together there: coarse, curly hairs, soft skin in folds, friction and moisture. The hairs grow out of the skin at an angle and in varying directions, so shaving in the direction of growth is hardly possible. Underwear edges, bras and every movement press the regrowing tips back into the skin, while sweat makes the horny layer swell and closes the follicle opening. In the short term, a fresh blade, loose cotton underwear and a day's break between shaving and exercise help.
In the long run, only less hair growth helps. The dark, thick hair in these areas absorbs a lot of laser light and responds well. In addition to its large spots, the DEWEON 4LD has one measuring 15 × 15 mm that lends itself to the groin and underarm. Its AI skin analyser adjusts wavelength and energy to the skin there, which is often darker.
Why do razor bumps in men mainly develop on the neck and under the chin?
Because the beard hairs on the neck grow flat against the skin and in whorls, so that any close shave there inevitably goes against the grain. The skin is soft and mobile, is stretched during shaving, and the shortened hair retracts beneath the surface. As it grows back, the sharp tip hits the follicle wall or curves back into the skin. Shirt collars and ties add friction. Immediate help comes from a trimmer that leaves about 1 mm, or a few days' break from shaving.
Those who want to keep their beard have only the area below the beard line lasered. Beard hairs are thick and deep-seated, so expect more like 8 to 10 sessions. The AlexDUAL UFO works with square spots from 10 mm, with which the contour can be traced cleanly, and covers skin types I to VI.
What does exfoliation do for ingrown hairs and which type is worthwhile?
Exfoliation loosens the horny layer over the follicle opening so that the regrowing hair can emerge freely, but it does not eliminate the cause. Chemical exfoliants with salicylic acid (BHA), glycolic acid or lactic acid, applied 2 to 3 times a week, are worthwhile. They act evenly and penetrate the follicle opening. Coarse grainy scrubs and hard brushes further irritate skin that is already inflamed and can trigger pigment spots on dark skin. Acids sting on freshly shaved or broken skin, so leave a day's gap before applying them.
Around laser hair removal, you pause exfoliation for a few days before and after each session. Treatment with the DEWEON 4LD or the AlexDUAL UFO often makes it unnecessary in the long run, because markedly fewer hairs grow back.
Can you have laser treatment while ingrown hairs are inflamed?
Slightly reddened bumps are no obstacle; purulent, open or severely swollen areas are left out until they have healed. The laser also reaches the hair beneath the skin and can even cause an ingrown hair to fall out. On acutely inflamed skin, however, the risk of blisters and pigment spots increases. In the days before the appointment, the rule is therefore: do not squeeze, do not dig with a needle or tweezers, apply warm compresses and only shave, never pluck. Plucked hairs leave the laser without a target.
Mention any open areas before the session. With the AlexDUAL UFO, the SIA AI uses cameras on the handpiece to set skin type and energy automatically. Whether an area is left out is nevertheless decided by the person carrying out the treatment.
Do dark marks and scars from ingrown hairs fade after laser treatment?
Dark marks generally fade as soon as no new inflammation is added; true scars, by contrast, remain. The marks are post-inflammatory hyperpigmentation: the skin produces more melanin after every inflammation. With no further pigment being added, it breaks the pigment down over weeks to months; in darker skin types this takes longer. Sun protection and refraining from scratching support this. Hair removal does not change small depressed scars or raised scars following deep inflammation; these need scar treatment of their own.
It is important that the laser itself does not trigger new marks. On dark skin, 1064 nm is therefore the first choice. The AlexDUAL UFO provides this wavelength as an Nd:YAG laser, the DEWEON 4LD as one of its four wavelengths.
How do you shave between laser sessions without getting new razor bumps?
Shave with a sharp blade, in the direction of growth and without stretching the skin, and only as often as necessary. Beforehand, warm water softens the hair and a shaving gel lets the blade glide. Razors with one or two blades cut less deeply below skin level than five-blade systems. An electric trimmer that leaves half a millimetre is the gentlest solution for those highly prone to razor bumps. Plucking, waxing and epilating are off limits during the course of treatment, because the laser needs the hair to be present in the root.
Before each appointment, the treatment area is shaved smooth the day before. With every session on the DEWEON 4LD or the AlexDUAL UFO, less grows back and shaving is needed less often.
Can hairs still become ingrown after laser hair removal?
Yes, occasionally, but much less often than before, because the remaining hairs are finer and softer. In the 1 to 3 weeks after a session, the skin pushes the treated hairs out. Dark dots often appear in the process that look like ingrown hairs but fall out by themselves. Gentle rubbing with a flannel from the second week onwards helps. If coarser hairs return after the course of treatment has been completed, for example owing to hormonal influences, ingrowth can return too. A top-up session is then usually sufficient.
Very light and fine residual hairs contain little pigment and barely respond to laser. At SIACSKIN, the VCL DERMALIGHT is intended for blonde, fine hairs, and the DEWEON 4LD and the AlexDUAL UFO for pigmented hairs.
When should an ingrown hair be treated by a doctor?
An ingrown hair should be seen by a doctor if the area swells severely, throbs, feels hot, forms pus or the redness spreads. You should also have fever, bumps that keep recurring in the same place and painful lumps in the underarm or groin checked, as there may be more behind them than a hair. Cutting it open or squeezing it yourself carries microorganisms deeper and leaves scars. Small bumps without irritation usually heal by themselves if you do not shave for a few days.
Once the skin has healed, it is worth looking at the cause. Laser hair removal with the DEWEON 4LD or the AlexDUAL UFO lowers the number of hairs growing back and with it the risk of new inflammation.
