Abstract

Lichen planus pigmentosus (LPP) is a chronic pigmentary disorder that shows diffuse or reticulated hyperpigmented, dark brown macules and patches on the sun-exposed areas such as the face, neck and other flexural folds. Clinically, it is different from classical lichen planus because LPP has a longer clinical course and it manifests with dark brown macules. In case of LPP, involvement of the scalp, nail or mucosal area is rare. The histopathological findings of the lesions show an atrophic epidermis, the presence of melanophages and a vacuolar alteration of the basal cell layer with a sparse lymphohistiocytic lichenoid infiltration. Here we report a case of lichen planus pigmentosus over sun protected areas.

• 1.   Bhutani LK, Bedi TR, Pandhi RK, Nayak NC. Lichen planus pigmentosus. Dermatologica 1974;149:43-50.
• 2.   Ghosh A, Coondoo A. Lichen planus pigmentosus: The controversial consensus. Indian journal of dermatology. 2016 Sep;61(5):482.
• 3.   Kanwar AJ, Dogra S, Handa S, Parsad D, Radotra BD. A study of 124 Indian patients with lichen planus pigmentosus. Clin Exp Dermatol. 2003;28:481–5. [PubMed: 12950331]
• 4.   Rieder E, Kaplan J, Kamino H, Sanchez M, Pomeranz MK. Lichen planus pigmentosus. Dermatol Online J. 2013;19:20713. [PubMed: 24365004]
• 5.   Vachiramon V, Suchonwanit P, Thadanipon K. Bilateral linear lichen planus pigmentosus associated with hepatitis C virus infection. Case Rep Dermatol. 2010;2:169–172. [PMCID: PMC2974975] [PubMed: 21060775]
• 6.   Gupta D, Thappa DM. Dermatoses due to Indian cultural practices. Indian J Dermatol. 2015;60:3–12. [PMCID: PMC4318059] [PubMed: 25657390]
• 7.   Al-Mutairi N, El-Khalawany M. Clinicopathological characteristics of lichen planus pigmentosus and its response to tacrolimus ointment: an open label, nonrandomized, prospective study. J Eur Acad Dermatol Venereol 2010; 24: 535–540.
• 8.   Kumar YH, Babu AR. Segmental lichen planus pigmentosus: An unusual presentation. Indian Dermatol Online J. 2014;5:157–9. [PMCID: PMC4030343] [PubMed: 24860750]
• 9.   Cho S, Whang KK. Lichen planus pigmentosus presenting in zosteriform pattern. J Dermatol. 1997;24:193–7. [PubMed: 9114619]
• 10.   Hong S, Shin JH, Kang HY. Two cases of lichen planus pigmentosus presenting with a linear pattern. J Korean Med Sci. 2004;19:152–4. [PMCID: PMC2822256] [PubMed: 14966361]
• 11.   Vineet R, Sumit S, Garg VK, Nita K. Lichen planus pigmentosusin linear and zosteriform pattern along the lines of Blaschko. Dermatol Online J. 2015;21 pii: 13030/qt4rk2w3rm. [PubMed: 26632802]
• 12.   Pock L, Jelınkova L, Drlık L, et al. Lichen planus pigmentosus-inversus. J Eur Acad Dermatol Venereol 2001; 15: 452–454.
• 13.   Robles Méndez JC, Rizo Frías P, Herz Ruelas ME, Pandya AG, OcampoCandiani J. Lichen planus pigmentosus and its variants: review and update. International journal of dermatology. 2018 May;57(5):505-14.
• 14.   Murzaku EC, Bronsnick T, Rao BK. Axillary lichen planus pigmentosus-inversus: dermoscopic clues of a rare entity. Diagnosis: lichen planus pigmentosus (LPP). J. Am. Acad. Dermatol. 2014; 71: e119–20.
• 15.   Sonthalia S, Errichetti E, Kaliyadan F, Jha AK, Lallas A. Dermoscopy of lichen planus pigmentosus in Indian patients–Pitfalls to avoid. Indian Journal of Dermatology, Venereology and Leprology. 2018 May 1;84:311.
• 16.   Kumarasinghe SP, Pandya A, Chandran V, Rodrigues M, Dlova NC, Kang HY, Ramam M, Dayrit JF, Goh BK, Parsad D. A global consensus statement on ashy dermatosis, erythema dyschromicumperstans, lichen planus pigmentosus, idiopathic eruptive macular pigmentation, and Riehl's melanosis. International Journal of Dermatology. 2019 Mar;58(3):263-72.
• 17.   Robles Méndez JC, Rizo Frías P, Herz Ruelas ME, Pandya AG, OcampoCandiani J. Lichen planus pigmentosus and its variants: review and update. International journal of dermatology. 2018 May;57(5):505-14.

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