Case 1A 38-year-old Caucasian male presented with a lesion on his left forearm which had been present for two years. It had become increasingly firm over time and was occasionally tender. Examination revealed a 5×5-mm blue/purple-coloured papule with a subcutaneous component palpable beyond the visible lesion. Dermoscopically, the centre of the lesion was white with peripheral pigmentation. Excision was arranged and the histological findings included a partially acanthotic, hyperkeratotic and parakeratotic [...]