Direct application of henna to the skin to create a temporary tattoo
is a process known as mehndi. Henna is a plant-based coloring that is approved
in the United States only as a hair dye. It is not approved for direct
application to the skin.
The U.S. Food and Drug Administration (FDA) has received reports of
skin injury when henna products are used to create temporary tattoos. The most
common problem caused by henna is a skin reaction (contact
dermatitis) to the pigment in the dye. Permanent loss of skin color
(hypopigmentation) in the design of the original tattoo has also been
reported.
The risk of developing a severe
allergic reaction to henna increases after an episode
of contact dermatitis. For that reason, it is recommended that you avoid hair
dyes containing henna if you have had a previous problem with an allergic
reaction to henna in a temporary tattoo.
Your first henna tattoo should be in a place where you can cover it
if it lasts longer than you expect. It is not a good idea try to remove your
henna tattoo; let it naturally wear off. Be very careful not damage your
skin—do not scrub or pick at your tattoo.