INTRODUCTION: There are few studies investigating dermoscopic features of subcorneal hematoma which is one of the imitators of acral melanoma. Here, we aimed to describe dermoscopic findings of SH which will facilitate the diagnosis by reducing the use of invasive procedures.
METHODS: The study included the patients with subcorneal hematoma. Clinical, demographic and dermoscopic findings of all the patients were retrospectively reviewed. The diagnosis of subungual hematoma has been confirmed by a positive scratch test in all the patients.
RESULTS: Red black (n=9, 45%) was the most common dermoscopic color followed by brown (n=4, 20%), red (n=3, 15%), black (n=2, 10%), brown black (n=1, 5%) and red brown (n=1, 5%). The most common pigmentation pattern was homogenous pattern (n=13, 65%). 11 (55 %) lesions showed globular pattern and 8 (40%) lesions exhibit parallel ridge pattern. 8 (40%) lesions showed a combination of homogenous and globular patterns. The globules were disconnected from the homogenous pigmentation in 6 lesions. In 2 (10%) lesions, the globules were localized over the homogenous pigmentation.
DISCUSSION AND CONCLUSION: The presence of homogenous red to brown to black pigmentation combined with globules may lead the correct diagnosis in subcorneal hematoma. Scratch test may be a practical and minimal invasive diagnostic option to confirm the diagnosis in suspicious cases. To the best of our knowledge, this is the most comprehensive study focusing on the dermoscopic aspect of subcorneal hematoma. (NCI-2018-0225.R1)