I love learning something new in medicine and this was a new one for me...black spot poison ivy. Poison ivy (also known as rhus dermatitis) is a common contact allergic dermatitis. Like poison oak and poison sumac, the chemical that causes a reaction is called urushiol. When this plant sap touches the skin a pruritic (itchy) red rash appears with little blisters that are often in a line.
Black spot poison ivy is the same urushiol but in humid, warm conditions it is oxidized by lactase from the skin and turns into a dark black lacquer color. It is an uncommon presentation because usually the sap is diluted by perspiration and never turns black.
Poison ivy/oak is more common in the summer and I treat lots of cases in Northern California because it grows like a weed. The worst cases are when someone tries to burn the plant and inhales the resin. Treatment of black spot poison ivy is the same as regular poison ivy. Washing the skin, clothes, and all contacts area immediately is critical. Severe cases may require systemic corticosteroids and rebound rash is common.
(Image from Consultantlive)
15 comments:
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Thank you for this article. I have regular ivy near my patio growing wild and thought it might be poison ivy but for the lack of three leaves. I searched Google and this article came up. Thanks to this blog I identified true Poison Ivy growing nearby that I would have missed had it not been for this post. Here's to a non-itchy summer!
Hello. My son is 2.5 years old and has black spot poison sumac. Severe case by far. I was trying to google "black spots on skin" and came to this. Thank you so much! I knew what I saw was VERY different than anything I've ever heard of but when I tried to explain it, no one would believe me! My first thought was that he got into some black permanent markers b/c it wouldnt' wash off. With a closer look I realized it was actually a PART of his skin!! I was worried but more curious b/c he didn't really seem to care or notice it was there. About six days later it started turning reddish pink where black was, then lots of broken sores and rashes and itchy bumps....we are still in presentation stage: after two weeks, STILL only getting the reaction to come out of his body. It has to burn itself out of his system. The longer it takes to present itself as a poison sumac/ivy/oak rash, the longer it lasts. It's a very dangerous reaction b/c it hides in the black lacquered markings deep in the skin. When you've never heard of it and you don't know what it is, you don't think think it's a poisonous reaction. By the time I realized, it was way too late. It's not contagious but it IS easily transferable on clothes and other skin if scratched. It's a difficult thing to deal with! It was 32degrees fehrenheit when we were out and he came across it. VERY humid. But it's typical for that temp where I am so it was nothing to be out in the heat like that. Normally sweat glands help fight off the poison but my son had two terrible things going against him. 1. Humidity 2. very tiny if existent, sweat glands. Perfect host for the chemical reaction to take place :( I'm worried, I hope he gets out of it without scarring :(( Our second visit to doctor was today. Thank God, by now I'm well versed/knowledgeable in this stuff now. Oh one more thibg, once it happens, it gets much worse the second and third etc. time around...
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