A rash from poison ivy, oak, or sumac looks like patches or streaks of red, raised blisters. The rash doesn't usually spread unless urushiol is still in contact with your skin.A rash from poison ivy, oak, or sumac looks like patches or streaks of red, raised blisters. The rash doesn't usually spread unless urushiol is still in contact with your skin.9 nov. 2020
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urushiol
Urushiol is a mixture of several closely related organic compounds. Each consists of a catechol substituted in the 3 position with a hydrocarbon chain that has 15 or 17 carbon atoms. The hydrocarbon group may be saturated or unsaturated. The exact composition of the mixture varies, depending on the plant source.
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