Clinical Dermatology Review

: 2020  |  Volume : 4  |  Issue : 2  |  Page : 136--140

Dermoscopic differentiation of pustular psoriasis and tinea incognito

Balachandra S Ankad1, Apoorva S Reshme1, Balakrishna P Nikam2, Nicholas D Drago1 
1 Department of Dermatology, S Nijalingappa Medical College, Bagalkot, Karnataka, India
2 Department of Dermatology, Krishna Institute of Medical Sciences (Deemed to be University), Karad, Maharashtra, India

Correspondence Address:
Balachandra S Ankad
Department of Dermatology, S. Nijalingappa Medical College, Nava Nagar, Bagalkot - 587 102, Karnataka

Introduction: Dermoscopy is a rapid diagnostic method in many inflammatory dermatoses which are diagnosed accurately by dermoscopy. Clinically, pustular psoriasis (PP) and tinea incognito (TI) look similar, and sometimes, TI is an invader into PP. Hence, it is important to differentiate each to manage them properly. Thus, a tool to distinguish both TI and PP is necessary for the correct diagnosis and management. Dermoscopy of PP is well-documented but not in TI. Here, we describe the dermoscopic differentiation of TI from PP with histopathological correlation. Materials and Methods: This was a cross-sectional study. Cases of PP and TI were included. DermLite 3 was employed. Potassium hydroxide (10%) mount and histopathological examination were done to confirm the diagnosis. Statistical analysis was done using “z” test. Results: A total of 20 TI and ten PP patients were in the study. Micropustules and scales were seen in all (100%) patients of PP and TI. Brown and black globules and hair changes were seen only in TI (100%), not in PP (0.0%). Red dots were observed in all PP patients (100%), not in TI (0.0%). Erythematous background in PP (100%) and in TI (70%) was statistically significant with P < 0.001. Conclusion: Dermoscopy is an in vivo tool to visualize the deeper structures of the skin. It demonstrates characteristic and different patterns in PP and TI as well, thus aiding in the differentiation of both the conditions. It would help treating physician to manage correctly and avoid unnecessary delay in the accurate diagnosis and treatment.

How to cite this article:
Ankad BS, Reshme AS, Nikam BP, Drago ND. Dermoscopic differentiation of pustular psoriasis and tinea incognito.Clin Dermatol Rev 2020;4:136-140

How to cite this URL:
Ankad BS, Reshme AS, Nikam BP, Drago ND. Dermoscopic differentiation of pustular psoriasis and tinea incognito. Clin Dermatol Rev [serial online] 2020 [cited 2021 Feb 25 ];4:136-140
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