Papules: Small solid rounded bumps rising from the skin that are each 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 i... Found on http://www.medterms.com/script/main/art.asp?articlekey=14075