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Differentiation of pityriasis rubra pilaris from plaque psoriasis by dermoscopy.
Dermatol Pract Concept. 2018 Oct; 8(4):299-302.DP

Abstract

Background

Diagnosing and differentiating pityriasis rubra pilaris (PRP) from other disorders can be a challenging task. Although histopathology remains the gold standard, it may not be feasible at times, especially in children. Being noninvasive, dermoscopy can be of great diagnostic importance in such a scenario. Dermoscopy overcomes the refractive properties of stratum corneum by interface medium or cross-polarization enabling easier visualization of lesions.

Objective

To study the dermoscopic features of PRP and compare them with dermoscopic features of psoriasis.

Patients and Methods

Retrospective observational analysis of dermoscopic characteristics of 28 patients with PRP (16) and psoriasis (12). Polarized dermoscopy at 10× magnification was performed and photographs were captured by Apple iPhone 7. The selection of dermoscopic variables was based on preexisting literature on the dermoscopic patterns of the 2 entities.

Results

The most frequent dermoscopic criteria of PRP were the presence of a central hair (16/16; 100%), follicular plugs (11/16; 68.7%), and perifollicular yellow/orange halos (9/16; 56.2%). No vascular structures were seen in our cases of PRP. Psoriasis was characterized by regularly distributed dotted vessels (12/12; 100%) and white scales (8/12; 66.6%).

Conclusions

Round-to-oval yellowish areas surrounding a central hair with or without follicular plugs represents the most frequent dermoscopic pattern of PRP.

Authors+Show Affiliations

Department of Skin & VD, Patna Medical College and Hospital, Patna, Bihar, India.First Department of Dermatology, Aristotle University, Thessaloniki, Greece.SKINNOCENCE: The Skin Clinic, Gurgaon, India.Department of Dermatology, Deen Dayal Upadhyay Hospital, New Delhi, India.Department of Skin & VD, Patna Medical College and Hospital, Patna, Bihar, India.Department of Skin & VD, Patna Medical College and Hospital, Patna, Bihar, India.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30479860

Citation

Jha, Abhijeet Kumar, et al. "Differentiation of Pityriasis Rubra Pilaris From Plaque Psoriasis By Dermoscopy." Dermatology Practical & Conceptual, vol. 8, no. 4, 2018, pp. 299-302.
Jha AK, Lallas A, Sonthalia S, et al. Differentiation of pityriasis rubra pilaris from plaque psoriasis by dermoscopy. Dermatol Pract Concept. 2018;8(4):299-302.
Jha, A. K., Lallas, A., Sonthalia, S., Jhakar, D., Udayan, U. K., & Chaudhary, R. K. P. (2018). Differentiation of pityriasis rubra pilaris from plaque psoriasis by dermoscopy. Dermatology Practical & Conceptual, 8(4), 299-302. https://doi.org/10.5826/dpc.0804a10
Jha AK, et al. Differentiation of Pityriasis Rubra Pilaris From Plaque Psoriasis By Dermoscopy. Dermatol Pract Concept. 2018;8(4):299-302. PubMed PMID: 30479860.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Differentiation of pityriasis rubra pilaris from plaque psoriasis by dermoscopy. AU - Jha,Abhijeet Kumar, AU - Lallas,Aimilios, AU - Sonthalia,Sidharth, AU - Jhakar,Deepak, AU - Udayan,Uday K, AU - Chaudhary,R K P, Y1 - 2018/10/31/ PY - 2018/02/08/received PY - 2018/07/03/accepted PY - 2018/11/28/entrez PY - 2018/11/28/pubmed PY - 2018/11/28/medline KW - dermoscopy KW - lichen nitidus KW - lichen spinulosus KW - pityriasis rubra pilaris KW - plaque psoriasis SP - 299 EP - 302 JF - Dermatology practical & conceptual JO - Dermatol Pract Concept VL - 8 IS - 4 N2 - Background: Diagnosing and differentiating pityriasis rubra pilaris (PRP) from other disorders can be a challenging task. Although histopathology remains the gold standard, it may not be feasible at times, especially in children. Being noninvasive, dermoscopy can be of great diagnostic importance in such a scenario. Dermoscopy overcomes the refractive properties of stratum corneum by interface medium or cross-polarization enabling easier visualization of lesions. Objective: To study the dermoscopic features of PRP and compare them with dermoscopic features of psoriasis. Patients and Methods: Retrospective observational analysis of dermoscopic characteristics of 28 patients with PRP (16) and psoriasis (12). Polarized dermoscopy at 10× magnification was performed and photographs were captured by Apple iPhone 7. The selection of dermoscopic variables was based on preexisting literature on the dermoscopic patterns of the 2 entities. Results: The most frequent dermoscopic criteria of PRP were the presence of a central hair (16/16; 100%), follicular plugs (11/16; 68.7%), and perifollicular yellow/orange halos (9/16; 56.2%). No vascular structures were seen in our cases of PRP. Psoriasis was characterized by regularly distributed dotted vessels (12/12; 100%) and white scales (8/12; 66.6%). Conclusions: Round-to-oval yellowish areas surrounding a central hair with or without follicular plugs represents the most frequent dermoscopic pattern of PRP. SN - 2160-9381 UR - https://www.unboundmedicine.com/medline/citation/30479860/Differentiation_of_pityriasis_rubra_pilaris_from_plaque_psoriasis_by_dermoscopy_ L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30479860/ DB - PRIME DP - Unbound Medicine ER -
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