Leser–Trélat sign
Onset of multiple seborrheic keratoses / From Wikipedia, the free encyclopedia
The Leser–Trélat sign is the explosive onset of multiple seborrheic keratoses[1] (many pigmented skin lesions),[2][3] often with an inflammatory base. This can be a sign of internal malignancy as part of a paraneoplastic syndrome. In addition to the development of new lesions, preexisting ones frequently increase in size and become symptomatic.