DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Allergic reaction to henna tattoo. Close-up of the swollen arm of a 7-year-old female patient caused by an allergic reaction to a henna tattoo. Henna is a paste of powdered leaves of the henna plant (Lawsonia inermis) mixed with a mildly acidic liquid such as tea or lemon juice. It washes off in a few weeks.
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