Dermatológia pre prax 1/2022

The importance of dermatoscopy in the diagnosis of benign lichenoid keratosis

Introduction: Benign lichenoid keratosis (BLK) is a benign skin lesion that can mimic malignant skin tumors. It often occurs as a solitary macula or papula with sharp margins in elderly patients at sites of actinic damage. Case: In the case report the authors described the clinical, dermoscopic and histopathological findings of BLK in a 63-year-old patient with a history of malignant skin tumors. As the authors did not have data on the duration, previous development of the lesion and at the same time they identified a diffuse granular pattern in the dermoscopic image, the described lesion was extirpated to exclude melanoma in the regression stage. Conclusion: The clinical picture of BLK is non-specific and may mimic other benign and malignant clinical units. Dermoscopic examination may reveal mainly pigmented BLK but may not help to diagnose non-pigmented BLK. In case of diagnostic embarrassment, histopathological examination is necessary.

Keywords: benign lichenoid keratosis, pigmented BLK, non-pigmented BLK, clinical, dermoscopic, histopathological features of the BLK