What is a solitary cutaneous neurofibroma?

A solitary cutaneous neurofibroma is a common nerve-sheath tumour. It presents as a skin-coloured, soft-to-firm papule or nodule with a smooth surface. Characteristically, pressing on the lesion with a finger causes it to fold in so that the outer surface becomes an inner one, a manoeuvre called "buttonhole invagination".

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Source: dermnetnz.org