Great Fairy Mask
From Zelda Wiki, the Zelda encyclopedia
This is one of the many masks which Link comes to own in Majora's Mask. The mask is given to Link at the Fairy Fountain in Clock Town after finding a stray fairy.
The mask glows pink whenever a stray fairy is nearby in a dungeon, and will attract stray fairies present in the room, so long as they are not trapped within a treasure chest or bubble.