http://wearenotfoodies.com/the-nutty...d-mangoes.html
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The oil urushiol is found in the skin of the mango and the shells of the pistachio and cashew. Given that it is near impossible that to slice a mango without exposing the fruit to the oils released from the skin, the urushoil makes contact with the fruit.
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Now I understand why some people can eat the fruit it is peeled - relatively small amounts of urushiol. Those who react to the peeled fruit are clearly more sensitive, so they react even to the small quantity that has contaminated the pulp.
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Likewise, since most pistachios come in their shells, one cannot avoid touching the shell to remove the nut. The process used to remove the cashew from it’s shell is to roast the shell. Proper roasting of the shells destroys the toxin. One could surmise that pistachios are roasted differently and the presence of the shell with the nut makes for contact with the toxic oil more likely.
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Mari, urushiol can be transferred from one surface to another. Repeat exposure can occur via contact with previously exposed clothing or surfaces. Ask hubby to clean areas any areas where the mangos have been; also wash any possibly exposed clothing. If hubby eats mangos in future, he needs to keep these things in mind too.
The wiki article on urushiol mentions that the odds of reacting increase with each exposure. Some do not react with their first exposure. (sounds like your case). Once a reaction occurs, subsequent exposures tend to produce progressively greater reactions.
One last thing. The additional rash around the mouth makes practically certain this is a mango allergy. In light of that,
taking Benadryl by mouth might be very helpful, especially if the rash is still developing at all. (Do not use Benadryl cream - only use the prescribed steroid.)
waves