Dermoscopy in the Evaluation of Pityriasis Versicolor: A Cross Sectional Study.

BACKGROUND: Pityriasis versicolor (PV) is a superficial mycosis caused by Malassezia yeast; a lipophilic fungus. Dermoscopy may be a value addition in the diagnosis of PV in some cases, where results of KOH (potassium hydroxide) examination are ambiguous. There is paucity of Indian data on dermoscopy of PV.

MATERIALS AND METHODS: Thirty consecutive patients diagnosed clinically with pityriasis versicolor were recruited in this pilot cross sectional study. Patients were subjected to KOH mount of the skin scrapings from the lesions which were positive in all the patients. Dermoscopy was performed in all using Universal Serial Bus (USB) dermoscope [Dinolite AMZT 73915, Edge 3] and features were recorded for analysis.

RESULTS: Hypopigmented variant was the most common type (80%). Dermoscopic analysis revealed altered pigmentary network as most common finding (100%) followed by scaling seen in 25 cases (83.33%). Folliculocentric pattern was appreciated in 20 cases (66.67%). A characteristic contrast halo ring around the primary altered pigmentation was observed in 20 cases (66.67%). Invasion of hair follicles by yeast was evident in 6 patients (20%).

CONCLUSION: Dermoscopy with characteristic features such as folliculocentricity, contrast halo sign, and yeast invasion of hair follicles can be a very useful aid in contributing towards diagnosing pityriasis versicolor.