Balm of Shifting Form

This alchemical concoction was derived from research into the transmutation effects of olothec slime. When a creature uses an action to rub this balm onto their body, they can alter their superficial features, such as changing the color of their skin, hair, and eyes and reshaping their ears and facial features. The balm doesn’t allow a creature to take on another specific creature’s form, but it can be used to alter appearance and apparent ancestry with ease.

• A creature using the balm adds double their proficiency bonus to any ability checks they make to create a visual disguise, and they have advantage on those checks. The effects of the
  balm last until the creature finishes a long rest.

Notes: The Balm of Shifting Form is a magic item from MCDM's "Where Evil Lives" and all credit goes to them.