Here is lovely picture is the Roman Emperor Vespasian suffering from leprosy. So, is this a medieval medical text?
Follow the link. It is actually the text of Mystère de la Vengeance, a play in French verse by the Benedictine monk Eustache Marcadé made for Duke Philip the Good of Burgundy.
According to the BL, “[t]his manuscript is of outstanding significance as a unique copy of the complete version of a theatrical text illustrated in a completely original way, and as an example of a securely dated and documented work made for one of the greatest patrons of the 15th century.”