|There are some people who
are allergic to pure henna, but this is very rare! The reaction to
pure henna is a Type I allergic reaction, entirely different from
and unrelated to the frequent Type IV sensitization to PPD in synthetic
hair dyes. It is very unusual for a person who is allergic to PPD
in synthetic hair dyes to also be allergic to henna.
There have been only a few reports of Type I, IgE-mediated allergic reactions to pure henna. This allergic reaction includes a tight feeling in the chest, sneezing, itchy eyes, runny nose, and a dry cough. The onset is soon after the person is exposed to henna powder or paste. If you think you might be allergic to henna, dab henna on your forearm and wait one hour. If you do not have the symptoms above within that hour, you are not allergic to henna. If there is an orange mark on your skin from the henna, don't worry. That's the henna color staining your skin, and that's what it's supposed to do, and that's harmless!
Type IV allergic reactions to PPD occur up to 10 days after exposure, so a patch test is NOT useful in determining synthetic hair dye allergy. Even if you have not had a reaction to hair dye before, the probability of sensitization increases with use. Synthetic hair dye allergic reactions include blistering, edema, rashes, itching, hair loss, and rare complications including death. See: Allergies to Synthetic Hair Dyes: Para-Phenylenediamine for medical papers detailing allergic and fatal reactions to PPD in commercial hair dye.
To learn more about Type I and Type IV allergic reactions see: http://www.unicapinvitrosight.com/templates/Page.asp?id=1891
If you get body art quality henna from mehandi.com, you can be certain that your henna does NOT have PPD or metallic salts in it! We send our henna to be tested at an independent laboratory to make certain it is absolutely pure. The countries who produce pre-mixed henna for hair dye often have lax regulations regarding cosmetic ingredient labeling, so do not have to list their ingredients. If a US company imports pre-mixed henna hair dye from another country, they can repackage and resell it with that inaccurate and misleading labeling. If you have a reaction to a pre-mixed henna for hair, you may be allergic to an unlisted ingredient, such as metallic salts, another plant powder, or PPD. Buy only body art quality henna if you want to be certain you're getting top quality pure henna without synthetic dyes or unlisted ingredients!
Allergic Reactions to "Black Henna" Temporary Tattoos
If you had a "black henna" temporary tattoo, and it itched or blistered, you are NOT allergic to henna. You had an allergic reaction to the para-phenylenediamine that was mixed into, or used instead of henna. If you ever had a "black henna" temporary tattoo, you probably should never use chemical hair dye again, because of the high probability of chemical sensitization and severe allergic reaction. Virtually all chemical hair dye has para-phenylenediamine or a derivative of PPD.
You can, however, safely dye your hair with henna IF, and ONLY IF, you use pure henna. Insist on henna that is laboratory certified to be body art quality and free of contaminants, pesticides or adulterants. Henna from mehandi.com is laboratory certified to be free of PPD and other contaminants, and you should be able to use it with no problem.
For more information on "Black Henna" allergic reactions, CLICK HERE!
Bohlar, Mulder, and van Ginkel,
IGE mediated allergy to Henna
Allergy, Vol 56, Issue: 3, March 1, 2001, pp. 248
Marjoie, and Bruynzeel
Occupational immediate-type hypersensitivity to henna in a hairdresser
American Journal of Contact Dermatitis 1996;7: 38040
Pepys, Hutchcroft, Breslin
Asthma do to inhaled chemical agents - persulphate salts and henna and hairdressers
Clinical Allergy, 1976; 6: 399-404
Starr, Yuringer, and Brasher
Immediate type I asthamatic response to henna following occupational exposure in hairdresser
Annals of Allergy 1982; 48: 98-99