Which treatment for the French revolutionist Jean-Paul Marat’s dermatitis (1793)? A biomedical analysis of his bathtub deposits

The history of medicine makes it possible to understand both the evolution of the conceptualization of pathological processes, but also the modification of therapeutic principles and patient management. In the context of dermatology, we are interested here in the case of Jean-Paul Marat, who was murdered in his bathtub at the end of the 18th century in France and had severe dermatosis. Examination of deposits of pharmaceutical products inside the bathtub in which he spent most of his time made it possible to reconstruct the nosological and therapeutic framework of his dermatosis.