Clinico epidemiological and mycological study of pityriasis versicolor

Snekavalli, R (2016) Clinico epidemiological and mycological study of pityriasis versicolor. Masters thesis, Madras Medical College, Chennai.


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Pityriasis versicolor, a mild, chronic superficial, cutaneous mycosis caused by Malassezia species is characterised by discrete or confluent, scaly, discoloured areas mainly on the upper trunk and other seborrheic areas. This infection commonly occurs in adolescents and young adults. AIMS AND OBJECTIVES : 1. To study the epidemiology of pityriasis versicolor. 2. To study the various clinical types. 3. To study the association of pityriasis versicolor with other dermatological disorders and systemic diseases 4. To identify the various species of Malassezia 5. To study the clinicomycological correlation. MATERIALS AND METHODS : 100 patients with pityriasis versicolor were randomly selected. Detailed history was taken and clinical examination was done. Scraping was done for all the patients KOH positive scrapings were subjected to culture in SDA with olive oil overlay. Tween assimilation was done from positive cultures and species isolation done. Gram staining was done from positive cultures. OBSEVATION AND RESULTS : Pityriasis versicolor is most commonly seen in the age group between 21- 30years.Males outnumbered the females. PV was more common among the students.Urban population was affected more than the rural population. Cosmetic concern was the main complaint. Duration of lesion in majority of the patients was 1 to 6 months. Diabetes and Seborrheic dermatitis was found to be the most commonly associated. Blood group A was commonly affected. Most common site was back and majority of the patients had more than 30%BSA.Achromicpityriasis versicolor was more common.Malasseziaglobosa was the most common species isolated. CONCLUSION : There is no significant change in clinico-epidemiology and presentation of pityriasis versicolor.A blood group was the most common blood group associated with pityriasis versicolor which is different from the previous study in which O blood group is the commonest association. Hence, further studies in a larger population would provide more conclusive evidence with regard to the blood groups.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Epidemiological and mycological ; Pityriasis Versicolor.
Subjects: MEDICAL > Dermatology Venereology and Leprosy
Depositing User: Punitha K
Date Deposited: 27 Jul 2017 12:00
Last Modified: 01 Mar 2018 02:29

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