Lichen planus is an immune-mediated condition that produces intensely itchy, flat-topped bumps with a distinctive purple or violet tinge. It is not rare, it is not contagious, and it is frequently mistaken for eczema or a fungal rash and treated with the wrong thing for months.
Recognising lichen planus
The classic rash is a cluster of small, flat-topped, shiny papules, often on the inner wrists, the ankles, the shins and the lower back. Looked at closely, many lesions carry a network of fine white lines across the surface. The itch is usually the reason people come in – it can be considerable.
A useful clue is that lichen planus tends to appear along a scratch or a scar. If you notice a line of new bumps exactly where you caught your skin, mention it, because that pattern is characteristic.
It is not only a skin condition
- Mouth – fine white lacy patches inside the cheeks, sometimes with tenderness or ulceration. This is common and often the only site involved.
- Nails – ridging, thinning and splitting. Severe involvement can permanently damage the nail.
- Scalp – redness and scaling around hair follicles, with patchy hair loss. This form can scar, and scarred follicles do not regrow hair.
- Genital skin – soreness and erosions, which people often delay reporting. It is worth mentioning; it is treatable and it is nothing to be embarrassed about.
Why the marks last so long on darker skin
For most patients with melanin-rich skin, the rash is not the lasting problem – the pigmentation left behind is. Lichen planus produces particularly dense, slate-grey or dark brown discolouration that persists long after the itch has gone, sometimes for a year or more.
This is worth knowing at the start, for two reasons. It sets expectations honestly. And it is a strong argument for treating early, because the more inflammation there is, the more pigment gets left behind. See hyperpigmentation and melasma treatment for the marks themselves.
How it is diagnosed
Often the appearance is characteristic enough to diagnose on examination. Where it is not – and particularly where the scalp, nails or mouth are involved – a skin biopsy settles it. That is done in the clinic under local anaesthetic and sent for histology.
Treatment
- Potent topical steroids, which are the mainstay for skin disease.
- Intralesional steroid injections for thick, stubborn plaques that topical treatment cannot penetrate.
- Preparations suited to the mouth, where ordinary creams are neither practical nor safe.
- Systemic treatment for widespread or rapidly progressing disease.
The one form that should not wait
If lichen planus is affecting your scalp – itching, tenderness, scaling around the follicles, hair thinning in patches – come in sooner rather than later. Treatment can halt the process and protect the follicles that remain, but it cannot recover what has already scarred. See hair loss treatment for how scalp disease is assessed.
The forms of lichen planus, and how urgent each is
Lichen planus behaves very differently depending on where it lands. Some forms are uncomfortable but self-limiting; one can cause permanent damage. It is worth knowing which is which.
| Form | What you notice | How urgent |
|---|---|---|
| Skin | Itchy purple flat-topped bumps, wrists, ankles, shins, lower back | Treat for comfort; usually settles over months |
| Mouth | White lacy lines inside cheeks, sometimes soreness or ulcers | Assess and review periodically |
| Nails | Ridging, thinning, splitting, nail shrinking | Sooner rather than later – severe cases damage the nail permanently |
| Scalp | Redness and scale around follicles, patchy hair loss, tenderness | Prompt. This form scars, and scarred follicles do not regrow |
| Genital | Soreness, erosions, discomfort | Treat – and please do mention it; it is common and treatable |
Why it appears where you scratched
Lichen planus has a characteristic habit: new lesions appear along lines of skin injury – a scratch, a shaving nick, the line of a watch strap or waistband. If you notice a neat row of new bumps exactly where you caught your skin, that pattern is genuinely useful diagnostic information, so mention it.
It also has a practical implication. Scratching does not just relieve the itch temporarily, it recruits new lesions. Controlling the itch early is therefore part of controlling the spread, not merely a comfort measure.
The pigmentation left behind
For most patients with melanin-rich skin, the rash is the short chapter and the discolouration is the long one. Lichen planus leaves particularly dense slate-grey or dark brown marks that can persist for a year or more after the bumps have gone.
Three things follow from that:
- Treat early. Less inflammation means less pigment deposited.
- Protect from sun while the marks fade, or they darken further and settle unevenly.
- Be patient with the marks. They are not treatment failure – they are the footprint of inflammation that has already resolved. See pigmentation treatment if they persist.
What to bring to your appointment
- Photographs of the rash when it was at its most active
- A full list of medicines and supplements – some drugs produce a rash that closely mimics lichen planus, and stopping the culprit is then the treatment
- Any mouth symptoms, even mild ones, and any dental work or new dental materials
- Whether nails or scalp are involved, so a longer appointment can be booked
- Anything already applied to it, including remedies from a chemist or market
A realistic view of the course
Skin lichen planus commonly settles over several months to a couple of years, and treatment is about controlling itch and limiting the pigment left behind while that happens. Mouth and scalp disease tend to run longer and need periodic review. It is not contagious, it is not caused by anything you did, and it does not turn into anything dangerous on the skin – though long-standing mouth involvement is worth keeping under observation.
Controlling the itch
The itch of lichen planus is often the hardest part, and it matters medically as well as for comfort – scratching recruits new lesions along the scratch line, so an uncontrolled itch actively spreads the rash.
Alongside prescribed treatment, these help:
- Keep the skin well moisturised. Dry skin itches more, and emollient reduces the urge without doing anything clever.
- Cool rather than hot. Hot showers and hot water provide a few seconds of relief and hours of worse itching afterwards.
- Keep nails short. If you scratch in your sleep, short nails limit the damage done before you wake.
- Cover affected areas at night with soft cotton, which breaks the scratch reflex.
- Treat early in a flare. Settling inflammation quickly is what limits both the itch and the pigmentation left behind.
If your mouth is involved
Oral lichen planus needs a slightly different approach, and small adjustments make a real difference:
- Avoid obvious irritants during a sore phase – very spicy food, acidic fruit and juices, rough or crusty foods, and alcohol-based mouthwash.
- Keep oral hygiene meticulous, because inflamed mucosa tolerates plaque poorly. A soft brush is worth switching to.
- Mention any sharp tooth, ill-fitting denture or new dental work, since persistent friction at one spot keeps that area inflamed.
- Report any patch that thickens, ulcerates and does not settle, rather than waiting for a routine review. Long-standing oral lichen planus is monitored for good reason.
What treatment realistically looks like
Expect a course rather than a single prescription. Active disease is settled first, then treatment is stepped down rather than stopped abruptly, and the pigmentation left behind is dealt with afterwards once inflammation has gone. Trying to treat the marks while the rash is still active is the commonest sequencing mistake, and it wastes both time and money.
Lichen planus in Nairobi – common questions
Is lichen planus contagious?
No. It is an immune-mediated condition, not an infection, and it cannot be passed to anyone.
How long does it last?
Skin lichen planus often settles over months to a couple of years. Mouth and scalp involvement tend to be more persistent and need longer follow-up.
Why is the skin so dark where the rash has healed?
Lichen planus leaves particularly stubborn post-inflammatory pigmentation on darker skin – often slate-grey or deep brown. It fades, but slowly, and it usually outlasts the rash itself by many months.
I have white lacy patches in my mouth. Is that the same thing?
It can be. Oral lichen planus produces fine white lacy lines inside the cheeks, sometimes with soreness or ulceration. It should be examined, and long-standing cases are worth reviewing periodically.
My scalp is itchy and I am losing hair in patches. Is that related?
Possibly, and this one should not wait. Lichen planus affecting the scalp can scar the hair follicles permanently, and hair does not regrow from a scarred follicle. Early treatment protects what is still there.
Will my nails recover?
Mild nail changes often improve with treatment. Severe, long-standing involvement can cause permanent nail damage, which is why it is worth being seen before that point.
Related conditions and treatments
Is lichen planus caused by a medicine I am taking?
Sometimes. A number of common medicines can produce a rash that looks very like lichen planus, and identifying it changes the treatment entirely – because the answer may be to change the drug rather than to treat the skin. Bring a complete list, including anything bought without prescription.
Will scratching make it spread?
Yes, in a specific way. New lesions tend to appear along lines of skin injury, so scratching recruits fresh bumps in the scratched area. Getting the itch under control early is part of limiting the spread.
Can it come back after it clears?
It can recur, though many people have a single episode. Recurrences are usually managed the same way, and knowing the pattern from last time makes treating it faster.
Do I need a biopsy?
Not always. Where the appearance is characteristic, examination is enough. A biopsy is worth doing when the picture is unclear, when the scalp or nails are involved, or when a drug-induced cause needs distinguishing – and it is done here in the clinic.
Will the dark marks ever go completely?
In most cases they fade substantially, though it takes many months and occasionally longer than a year. Sun protection while they settle makes a genuine difference to how evenly they fade.
Can lichen planus affect my nails permanently?
Mild changes usually recover with treatment. Severe, prolonged nail involvement can cause lasting damage, which is the argument for having it assessed early rather than waiting to see whether it settles.
Is it linked to any internal condition?
There are recognised associations worth being aware of, which is why a small set of blood tests is sometimes suggested at the first visit. It is a check rather than a cause for alarm.
Book a lichen planus consultation
Dr Nancy Omwenga sees patients at Landmark Plaza, Argwings Kodhek Rd, from 7:00am on weekdays. If the scalp, nails or mouth are involved, say so when booking so enough time is set aside.
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SkinByDrNancy
Landmark Plaza, 2nd Floor, Argwings Kodhek Rd, Nairobi
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