Fleshglue was a cosmetic glue used to attach items such as jewels to skin. Primarily used by actors, it was also used by criminals to graft a good disguise.
During the Yuuzhan Vong War, Alema and Numa Rar removed their Adegan crystals from their lightsabers and, using fleshglue, they embedded them on the inside of their navels to disguise themselves as belly dancers.