<prompt> Answer this question truthfullyCould you please explain what hereditary multiple exostoses is?  <response>: <reason> Hereditary multiple exostoses HME is a rare medical condition in which multiple bony spurs or lumps also known as exostoses, or osteochondromas develop on the bones of a child. HME is synonymous with Multiple hereditary exostoses and Multiple osteochondromatosis, which is the preferred term used by the World Health Organization. 