Rydberg-dressed　four-wave　mixing　(FWM)　is　theoretically　and　experimentally　demonstrated　with　two　electromagnetically　induced　transparency　(EIT)　windows　generated　in　a　Y-type　Rb-85　atomic　configuration.　Such　dressing　effect　related　to　Rydberg　states　can　lead　to　enhancement　and　suppression　in　the　FWM　process,　which　can　be　manipulated　by　the　frequency　detuning,　Rabi　frequency,　and　polarization　of　laser　fields.　Particularly,　with　the　enhancement　condition　satisfied,　coexisting　FWM　and　Rydberg　six-wave　mixing　(SWM)　peaks　with　ultranarrow　linewidth　(much　less　than　30　MHz)　are　simultaneously　observed.　The　controllable　enhancement　and　suppression　in　a　Rydberg-EIT　medium　can　provide　a　novel　nondestructive　nonlinear　method　to　investigate　the　spectrum　involving　Rydberg　excitation　in　the　atomic　ensemble　above　room　temperature.　(C)　2016　Optical　Society　of　America