Indexed with PubMed and Science Citation Index (E) 
Users online: 2163 
     Home | Feedback | Login 
About Current Issue Archive Ahead of print Search Instructions Online Submission Subscribe What's New Contact  
  Navigate here 
   Next article
   Previous article 
   Table of Contents
 Resource links
   Similar in PUBMED
    Search Pubmed for
    Search in Google Scholar for
  Related articles
   [PDF Not available] *
   Citation Manager
   Access Statistics
   Reader Comments
   Email Alert *
   Add to My List *
* Registration required (free)  
  In this article
    Case Report

 Article Access Statistics
    PDF Downloaded0    
    Comments [Add]    
    Cited by others 2    

Recommend this journal

Year : 2003  |  Volume : 69  |  Issue : 1  |  Page : 42-43

Pityriasis rosea unilateralis

Dept. of Dermatology, Venereology & Leprology, Govt. Medical College & Hospital, Faridkot - 151 203, Punjab

Correspondence Address:
C/o. Brar Eye Hospital, 637, Street No. 4, Lajpat Nagar, Kotkapura - 151 204, Punjab


The classical pityriasis rosea presents with erythematous papulosquamous lesions. It has got many clinical and morphological variants. Pityriasis rosea unilateralis is very rare variant of pityriasis rosea. We are reporting two cases of unilateral pityriasis rosea.

How to cite this article:
Brar B K, Pall A, Gupta R R. Pityriasis rosea unilateralis. Indian J Dermatol Venereol Leprol 2003;69:42-3

How to cite this URL:
Brar B K, Pall A, Gupta R R. Pityriasis rosea unilateralis. Indian J Dermatol Venereol Leprol [serial online] 2003 [cited 2021 Jan 20];69:42-3. Available from:

   Introduction Top

Pityriasis rosea (PR) is an acute, self limiting skin eruption characterized by distinctive and constant course with minimal constitutional symptoms. Classically, it presents as a primary plaque (herald patch) which is followed by a generalized secondary rash after 1 or 2 weeks. In about 20% of patients the picture diverges from the classical one.' Unilateral variant of PR is very rare. The present cases are reported because of the rarity of the condition.

   Case Report Top

Case 1: A 20-year-old male presented with well defined, oval, hypopigmented plaques with central wrinkled areas over the left side of back since 5 days. The lesions had an erythematous peripheral zone which at few places was separated by collarette of fine scaling. The herald patch was absent [Figure - 1].
Case 2: A-25- year old female presented with well-defined salmon coloured plaques over the right forearm since seven days. The lesions were accompanied by mild itching. Patient first noticed a plaque over the wrist which was followed by new plaques of various sizes. On examination, two big plaques were present on the wrist and middle part of forearm with small lesion present in between. At places lesions were merging with one another. Some lesions showed typical collarette of scales [Figure - 2].
In both cases, there was no history of insect bite, or drug intake. KOH preparation for fungus was negative. Lesions remained unilateral and no new lesions were seen during follow-up. The routine tests were normal and the histopathological findings were consistent with the diagnosis of pityriasis rosea.

   Discussion Top

Pityriasis rosea is characterized by erythematosquamous lesions usually confined to trunk, the base of the neck and the upper third of the arms and legs. Infectious agents (staphylococcus albus, spirochaetes, beta-hemolytic streptococcus, mycoplasma, picorna virus) drugs and environmental factors have been implicated in its pathogenesis. Many variants viz., plaques, urticaria, vesicles, bullae, lichenoid lesions, non­-palpable purpura, wrythema multiforme-like lesions, gigantic plaques and even exfoliative dermatitis have been reported.[2] Pityriasis rosea unilateralis has already been reported by Delcampo and others.[3],[4] The eruption appeared in crops in both cases and became confluent in case 2. In both patients the lesions tended to remain localized. 

   References Top

1.Wasilew SW Pityriasis rosea (Gibert). Z Hautkr 1981;57:1028.  Back to cited text no. 1    
2.Parson, Richmond, Pityriasis rosea update. J Am Acad Dermatol 1986;15:159-167.  Back to cited text no. 2    
3.Delcampo DC, Barsky 5, Tisocco L, et al. Pityriasis rosea unilateralis. Int J Dermatol 1983;312-317.  Back to cited text no. 3    
4.Chopra A, Mittal RR, Parsad D. Pityriasis rosea unilateralis. Indian J Dermatol Venereal Leprol 1993;59:129.  Back to cited text no. 4    


Print this article  Email this article
Previous article Next article


Online since 15th March '04
Published by Wolters Kluwer - Medknow