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Green colour as a novel dermoscopic finding in the diagnosis of haemosiderotic dermatofibroma

Dermoscopy is a non-invasive in vivo tool that increases the diagnostic accuracy of pigmented skin lesions. By allowing visualisation of sub-macroscopic pigmented structures that correlate with specific underlying histopathological findings, dermoscopy provides a more powerful tool than the naked eye examination for clinicians to determine the need to excise a lesion. Colours play an important role in dermoscopy. Commonly identified colours include black, brown, blue-grey, red and white. As a general rule, when approaching pigmented skin lesions the more colours there are, the more suspicious the lesion. Dermatofibroma (DF) is a very common benign fibrosing skin tumour usually diagnosed clinically. Dermoscopically, the most common pattern associated with DF is a central, scar-like patch with a delicate peripheral reticular network. However, these tumours have a wide range of presentations clinically and dermoscopically, sometimes mimicking melanomas, primarily in atypical cases or rare variants. Haemosiderotic DF is a variant composed of numerous small vessels, extravasated erythrocytes and intracellular and extracellular haemosiderin deposits. We here present two cases of haemosiderotic DF, which revealed a green colour, a novel dermoscopic finding.