Papule
A small solid rounded bump rising from the skin that is usually less than 1 centimeter in diameter (less than 3/8 inch across).
Papules may open when scratched and become crusty and infected.
The term 'papule' is derived from Latin from 'papula,' a pimple.
Dermatologists (and other physicians) call any small solid circumscribed bump in the skin a papule, as opposed to a vesicle which contains fluid or a macule which is flat and even with the surrounding skin.