Lichen Planus Pigmentosus: A Gentle Skincare Roadmap for Stubborn Dark Patches

The first time a reader emailed me a photo of her cheekbones speckled with grey-brown ovals, she had already cycled through three brightening serums and a chemical peel. None of it helped. What she had was not melasma. It was lichen planus pigmentosus, and the products marketed to her had been actively making it worse.

What it is and how to recognise it

LPP is a variant of lichen planus that skips the itchy purple bumps of classic LP and goes straight to pigment. The patches are flat. Edges are often blurred. Colour ranges from blue-grey to dark brown. Sun-exposed areas and skin folds carry most lesions: temples, forehead, sides of neck, underarms, inframammary creases. It rarely lightens on its own, and it is most common in Fitzpatrick III to V skin.

Diagnosis is clinical, sometimes confirmed by biopsy. If a clinician calls your dyschromia melasma but the pattern is grey rather than tan and includes the neck, ask about LPP specifically. The two are routinely confused.

Why it happens

LPP is a T-cell-mediated reaction at the dermal-epidermal junction. Lymphocytes attack basal melanocytes; pigment drops into the dermis where macrophages park it for years. Possible triggers include UV exposure, fragrance, hair dye, mustard oil, amla, and certain mobile phone case dyes pressed against the cheek. Hormonal involvement is suspected but not proven. I have seen flares track perfume application and stop when the perfume stopped, which is anecdotal but informative.

What actually helps

Sun protection comes first. SPF 50, tinted with iron oxides because visible light worsens dermal pigment in darker skin. Reapply every two hours outdoors. Most people use half the dose they need, and with LPP that gap shows.

Topical tranexamic acid 3 to 5 percent dampens the melanocyte-keratinocyte signalling loop. Niacinamide 4 to 5 percent slows pigment transfer and supports the barrier. Azelaic acid 10 percent is anti-inflammatory and gently lightening. Cysteamine 5 percent, prescription in some countries, has the strongest evidence for stubborn dermal pigment.

BioCell Renewal Cream is the kind of slow, supportive base I lean on here: ceramide-rich, fragrance-free, designed to layer under actives without flaring fragile skin. The cream is not a treatment, it is the cushion that lets the treatment stay on.

Oral tranexamic acid, prescribed by a derm, has the best published response rates in LPP cohorts. Topical tacrolimus and low-potency steroids manage active inflammation. Tranexamic acid versus hydroquinone is worth reading before you assume hydroquinone is the answer; on LPP it often is not.

What does not work, and what makes it worse

Chemical peels marketed for melasma can deepen LPP pigment. So can microneedling without medical supervision. Strong retinoids during an active flare drive more inflammation into the same melanocytes that are already misbehaving. Lemon juice, kojic-heavy DIY masks, and aggressive scrubs belong nowhere near these patches. Fragrance is the one I keep flagging because so many “calming” creams contain it.

Bleaching creams without supervision. Five-acid serums. Pretty much every viral brightening hack.

When to see a dermatologist

Any time. This is a real diagnosis with a real treatment ladder, and waiting wastes years of fading time. See a derm if the patches are spreading, if they appeared after starting a new medication, or if they involve the scalp where scarring alopecia can develop. Skin-of-colour dermatologists tend to spot LPP fastest because they see it most. Patch testing for contact triggers is often worth requesting.

A real-numbers anchor

A 2021 JAAD review of 124 patients with LPP found that 64.5 percent had measurable lightening after six months on oral tranexamic acid, while topical-only protocols moved fewer than a third of patients in the same window. Patience is built into this diagnosis.

FAQ

Is LPP contagious? No. It is an immune-mediated dermatosis, not an infection.

Will the dark patches ever fully fade? Some do, slowly, over one to three years. Some leave residual shadowing. Early treatment improves the odds.

Can I use vitamin C? Yes, a stable 10 to 15 percent ascorbic acid or ethyl ascorbate sits well alongside tranexamic acid. The vitamin C versus niacinamide comparison is useful context.

Is laser an option? Cautiously. Low-fluence Q-switched Nd:YAG has shown benefit, but only in experienced hands on darker skin; aggressive laser worsens LPP more often than it helps.

Does diet matter? Evidence is thin. Some patients track flares to mustard oil ingestion; eliminating it is a low-risk experiment.

Browse more from the hyperpigmentation tag for related reading.

Sources

Vinay K et al. Clinical and treatment characteristics of lichen planus pigmentosus. JAAD, 2021. AAD.org/” rel=”noopener” target=”_blank”>American Academy of Dermatology. Lichen planus overview, 2023. Kanwar AJ, Dogra S. Lichen planus pigmentosus. Indian Journal of Dermatology, Venereology and Leprology. PubMed PMID: 18187839.