On acral surfaces a parallel ridge pattern is concerning for #melanoma, while a parallel furrow pattern is reassuring. But how can you tell which lines are furrows and which are ridges? Look out for the opening of the #sweat glands (the small white dots) - they will be on the ridges. Accordingly, this #dermoscopic photo demonstrates a parallel furrow pattern. #dermoscopy #dermatology #dermatologist @acderm #skin @dermatologyaustralasia #acralmelanoma #skincancer