Henna is a natural dye made from the leaves of the Lawsonia inermis plant. It has been used for centuries to dye skin, hair, and nails. Henna can also be used as a temporary tattoo.
The most common side effect of henna is an itchy feeling on the skin. This is caused by the release of histamine, which is a natural body chemical that helps to protect us from infections.
There are a few ways to stop your hands from itching after henna. You can try using a mild steroid cream such as hydrocortisone, or you can take an antihistamine such as diphenhydramine. You can also try applying a cool compress to the itchy area.
If the itching is severe, you should see a doctor. Severe itching can be a sign of an allergic reaction to henna.