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ORPHA:254463

Lichen planus pigmentosus

high confidenceDisorder

Also known as: LP pigmentosa · LP pigmentosus · Lichen planus pigmentosa · Lichen planus pigmentosus inversus

Publications

659

90.5th percentile

Trials

4

Interventional, condition-specific

Researchers

805

Distinct authors in sample

Gene link

—

Readiness

2/6

Stages with a signal

Clinical definition (Orphanet)

Lichen planus (LP) pigmentosus is a rare variant of cutaneous lichen planus characterized by the presence of hyperpigmented lichenoid lesions in sun-exposed or flexural areas of the body.

How rare: How common this is has not been clearly measured.

Orphanet entry

Cross-references

Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.

Additional Mondo synonyms (2)

lichen planus pigmentosa · lichen planus pigmentosus inversus

Research stages

Trial readiness signals

Where this condition sits on an open-data research pipeline — not how close a treatment is, and not medical advice. Empty stages often mean “not in these databases under this Mondo ID,” not “impossible.”

2/6 stages with a signal

An interventional trial matched this condition name on ClinicalTrials.gov — see trials below.

  1. Gene identifiedNot found

    No GenCC disease–gene assertion in this build

  2. LiteraturePresent

    659 matched papers (518 in last 10 years) Source

  3. Phenotype characterisedNot checked

    Not yet enriched from Monarch / HPO

  4. Animal modelNot checked

    Not yet enriched from Monarch / Alliance

  5. Orphan designationNot checked

    FDA/EMA orphan-drug designation not enriched yet

  6. Interventional trialPresent

    4 matched on ClinicalTrials.gov (1 recruiting in sample)

Biology

Genes and phenotypes

Gene–disease validity from GenCC, plus phenotypes and animal models joined from Monarch Initiative via Mondo ID — not a clinical diagnosis aid.

Do we know what causes it?

Not yet — the cause hasn't been pinned down in GenCC.

No strong gene–disease assertion joined for this Orphanet entity.

Phenotypes (Monarch / HPO)

Not enriched in this build — Monarch phenotype joins were not run for this record.

Animal models (Monarch / Alliance)

Not enriched in this build.

Literature

Is anyone studying this?

659

659 papers have been published on this condition. That is a real research literature — still far smaller than common diseases (breast cancer: over 700,000 papers). Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=5449) is 41.

659 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 41 (publications denominator n=5449).

518 in the last 10 years · high confidence · 90.5th percentile (publications denominator)

Phrase hits: 659 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

805

Distinct author names in 200 sampled papers — named people below.

Who's working on it?

People publishing on this condition (sampled Europe PMC records). Affiliation is the most recent found in that sample.

  1. 01
    Kumaran MS6 papers · 2026

    Department of Dermatology, Venereology and Leprology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.

    Papers in Europe PMC
  2. 02
    Parsad D5 papers · 2026

    Department of Dermatology, Venereology and Leprology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.

    Papers in Europe PMC
  3. 03
    Rodrigues M5 papers · 2025

    Chroma Dermatology, Pigment and Skin of Colour Centre, Melbourne, Australia.

    Papers in Europe PMC
  4. 04
    Sarkar R5 papers · 2026

    Lady Hardinge Medical College, Part of the Delhi University, New Delhi, Delhi, India.

    Papers in Europe PMC
  5. 05
    Bishnoi A4 papers · 2026

    Department of Dermatology, Venereology and Leprology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.

    Papers in Europe PMC
  6. 06
    Vinay K4 papers · 2026

    Department of Dermatology, Venereology and Leprology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.

    Papers in Europe PMC
  7. 07
    Elbuluk N3 papers · 2026

    Department of Dermatology, Keck School of Medicine of University of Southern California, Los Angeles, California, USA.

    Papers in Europe PMC
  8. 08
    Gupta V3 papers · 2023

    Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India.

    Papers in Europe PMC
  9. 09
    Meziane M3 papers · 2026

    Dermatology and Venereology Department, Ibn Sina Hospital, Mohammed V University of Rabat, Morocco.

    Papers in Europe PMC
  10. 10
    Mohammad TF3 papers · 2025

    Department of Dermatology, Henry Ford Health, Detroit, Michigan, US.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

4

interventional trials for this specific condition

4 interventional trials matched this specific condition name; 1 currently recruiting in our sample. 139 trials are registered for lichen planus, the broader category — shown separately because they may or may not enrol this specific subtype.

Data as of 27 July 2026

4 interventional trials — more than 73% of diseases in the trials denominator have none at all (5114 of 7003; this disease is at the 86.7th percentile).

high confidence · 86.7th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

4 interventional trials matched after quoted-phrase search and title/condition post-filter.

Broader category: lichen planus

139

Interventional trials for the parent category, exclusive of NCT IDs already counted above. Eligibility for this subtype is not guaranteed.

Worth raising with a clinician. How we count trials.

Recruiting under the broader category

Where to find support

We do not yet link condition-specific patient organisations. These umbrella groups support undiagnosed and ultra-rare families:

India — NPRD

Last verified 2026-07-26

This ORPHAcode is not on our curated NPRD list (direct or Mondo-parent match). That does not decide clinical eligibility; families in India should ask a notified Centre of Excellence about current coverage.

Hand-curated for this project. ORPHAcode mappings are best-effort and may be incomplete or imprecise for umbrella categories. Parent (Mondo) matches mean the policy lists a broader category — confirm eligibility with a Centre of Excellence. Financial entitlements summarised from public policy statements and may change. This is not official government guidance.

How we counted this

Europe PMC query (preferred label + any corrected label + Orphanet and Mondo exact synonyms, stoplisted; unioned with resolved MeSH labels when available). UMLS / OMIM / NCIT cross-references are stored on the overview but are not added to the query string.

"Lichen planus pigmentosus" OR "LP pigmentosa" OR "LP pigmentosus" OR "Lichen planus pigmentosa" OR "Lichen planus pigmentosus inversus"

Run this search on Europe PMC

ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):

"Lichen planus pigmentosus" OR "LP pigmentosa" OR "LP pigmentosus" OR "Lichen planus pigmentosa" OR "Lichen planus pigmentosus inversus"

Interventional trials matched via: phrase (mesh = registered under a MeSH descriptor no name phrase would catch; recall-expansion = gene / selected parent terms used only for trials).

Study-type breakdown: 4 interventional · 0 observational · 0 expanded access. Only interventional studies enter the trial headline.

Parent-category trials query:

"lichen planus"

Query health: ok — strategies attempted: phrase; with hits: phrase

Run this search on ClinicalTrials.gov

Confidence reasoning

  • Preferred label is multi-word and distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus

Ingested 2026-07-27T11:03:28.868Z