Mango is in the same botanical family as poison ivy. The sap of the tree and the rind of the mango fruit contain urushiol , the oil that causes the poison ivy rash. The pulp of the mango fruit does not contain urushiol, so if someone is sensitive to poison ivy, they can have someone else peel the fruit for them and then they can eat the fruit without harm. Also, it is not a good idea to fall asleep under a mango tree if you are sensitive to poison ivy.