Samuel Hafenreffer

Samuel Hafenreffer (April 26, 1587 – September 26, 1660) was a German physician, who in 1660 introduced the definition of pruritus. Pruritus is the "unpleasant sensation" the body produces that provokes a person to itch themselves. Hafenreffer is also credited as being the author of the first textbook in German speaking countries on the subject of dermatology.