pseudoxanthoma elasticum

noun

pseu·​do·​xan·​tho·​ma elas·​ti·​cum ˌsüd-ō-zan-ˈthō-mə-i-ˈlas-ti-kəm 

: a chronic degenerative disease of elastic tissues that is marked by the occurrence of small yellowish papules and plaques on areas of abnormally loose skin