These reactions can occur immediately after getting a temporary tattoo using traditional red henna or “black henna. " Reactions from temporary henna tattoos can also occur up to two or three weeks after receiving the tattoo. You can also experience adverse side effects from hair dye that contains “black henna. ”

Ask specifically about the inclusion of p-phenylenediamine, or PPD, and avoid getting a tattoo with this additive.

Children with glucose-6-phosphate dehydrogenase deficiency are at particular risk, as applying henna to the skin of children with this condition can cause a life-threatening condition called hemolysis. Seek immediate medical attention if a child with glucose-6-phosphate dehydrogenase deficiency has been exposed to henna.

While inks marketed as “black henna” create tattoos that are darker and last longer than those created with traditional henna, these dyes are harmful and should be avoided. Black henna is actually banned in some countries. [4] X Expert Source Moushami IyerHenna Artist Expert Interview. 12 July 2021.