Poison ivy, sumac or oak?

This was what my Monday was all about, my son Michael woke up at 6am with his face swallon so badley he couldn't open his eyes! So I rushed him to the ER where they put him on steroids, Benadryl and calamine lotion, and it's working very good thankfully, he gets poison ivy every year around this time but it's never been this bad:( but about the above question, I'm asking Bc the doc couldn't pin point which one he has? Any ideas? I'd like to kno for future references.

Poison ivy, sumac or oak?Poison ivy, sumac or oak?
Nikki Hicks
    Comment deleted
    Nikki Hicks
    That's what I thought also, but the doc said it's deffintly one of the three but he told me he couldn't say which Bc they all basically do the same process.
      I'm sorry, I don't know--perhaps you could identify the plants where he was over the weekend?
      About Nikki Hicks
      Birth: November 25
      On Moms.com since: Nov 29, 2013
      Hello, the name is Mara, but i go by Nikki, I'm a 25 year old SAHM, Married to my high school sweetheart, we've been blessed with 3 beautiful kids, Chloe(6) Michael(4) Myles(2).