An allergic reaction to henna is rare, considering that pure henna is supposed to be one of the safest things that you can put on your skin. However, a lot of people add chemicals, such as phenylenediamine (PPD), to henna to make it appear darker and stay for longer. Almost all the allergic reactions to henna are because of these chemicals.
The chemical ingredients that cause an allergic reaction usually include PPD, kerosene and other chemicals. In most cases, the allergic reaction will be limited to the area where henna is applied; however, it can also be widespread and have systemic effects.
Some common symptoms include:
More severe symptoms of this allergic reaction are rare and can include loss of breath, watering eyes, redness all over the body and palpitations.
Consult a dermatologist to treat any allergic reaction to henna. The most common treatments will include:
Remember that henna will always stain only in a shade of orange, red, brown or dark brick. Any other colors like green, purple, black or yellow will come from dyes that could be harmful to the skin. Find out what the other dye is or avoid colored henna altogether.
It is unlikely that the addition of essential oils will cause an allergic reaction to henna. These essential oils are often added to make the henna more fragrant. The use of these essential oils with henna will do no harm.
The addition of these solvents is a common practice in certain countries where artists want a darker, almost black stain of henna. Avoid any henna when you are able to smell these solvents.
This is another product that is added to make the henna stain very dark. Commonly used by henna artists in South India, camphor can cause allergic reactions. We recommend that any henna products which have camphor added to them be avoided completely.
Different people have different tolerance to citrus oils; however, they are known to leave the skin patchy and itchy, and cause peeling. You may want to avoid henna that smells citrusy to prevent the above mentioned allergic reactions.
Anyone who has a nut allergy should be very careful to make sure that no walnut powder has been added to the henna. This is a common practice in certain parts of the world and can cause some very dangerous anaphylactic reactions.
This is a kind of dye that is added to henna to make it darker. An allergic reaction to henna may happen if black kattam has been added to it.
A lot of people disguise PPD as henna stones or black rocks from the Nile and take advantage of gullible people. If you hear these words, avoid buying henna from them.
Note: There is a skin test available for people who have never used henna before. It is called the naphthoquinone sensitivity test. If you are positive to it, then you should avoid henna use at all costs.