Henna (also called mehndi, anella, or lalle) is a temporary “tattoo” and hair dye made from the henna plant (Lawsonia inermis). People in many cultures use it to create elaborate designs on the skin.

In some cultures, henna designs are synonymous with celebration. The night before a major event like a wedding, it’s common practice to decorate hands — and sometimes even feet — with the popular ...