Ma'anar ƙamus na kalmar "decubitus ulcer" wani nau'in ciwon fata ne, wanda kuma aka sani da ciwon matsi, matsa lamba, ko ciwon gado. Rauni ne da aka keɓance ga fata da nama na cikin gida, yawanci akan shaharar ƙashi, wanda ya haifar da tsawaita matsa lamba, gogayya, ko ƙarfi. Cututtukan Decubitus galibi suna faruwa ne a cikin mutanen da suke kwance, da keken hannu, ko kuma ba su motsa jiki ba, kuma suna iya zama babban matsala na yanayin kiwon lafiya iri-iri, gami da gurɓatacce, raunin kashin baya, da tsufa. Kalmar "decubitus" ta fito ne daga kalmar Latin "decumbere," wanda ke nufin "kwance."