Recently,　wearable　sensor　technology　has　drawn　attention　to　many　health-related　appliances　due　to　its　varied　existing　optical,　electrical,　and　mechanical　applications.　Similarly,　we　have　designed　a　simple　and　cheap　lift-off　fabrication　technique　for　the　realization　of　large-area　biocompatible　random　lasers　to　customize　wearable　sensors.　A　large-area　random　microcavity　comprises　a　matrix　element　polymethyl　methacrylate　(PMMA)　in　which　rhodamine　B　(RhB,　which　acts　as　a　gain　medium)　and　gold　nanorods　(Au　NRs,　which　offer　plasmonic　feedback)　are　incorporated　via　a　spin-coating　technique.　In　regards　to　the　respective　random　lasing　device　residing　on　a　heterogenous　film　(area　＞　100　cm(2)),　upon　optical　excitation,　coherent　random　lasing　with　a　narrow　linewidth　(similar　to　0.4　nm)　at　a　low　threshold　(similar　to　23　mu　J/cm(2)　per　pulse)　was　successfully　attained.　Here,　we　maneuvered　the　mechanical　flexibility　of　the　device　to　modify　the　spacing　between　the　feedback　agents　(Au　NRs),　which　tuned　the　average　wavelength　from　612.6　to　624　nm　under　bending　while　being　a　recoverable　process.　Moreover,　the　flexible　film　can　potentially　be　used　on　human　skin　such　as　the　finger　to　serve　as　a　motion　and　relative-humidity　sensor.　This　work　demonstrates　a　designable　and　simple　method　to　fabricate　a　large-area　biocompatible　random　laser　for　wearable　sensing.