Assignment task: You are scheduled to see a three-year-old male with "red weepy eyes". Last seen for 18 month well-check.
"This happens off and on. This is probably the third time. I have not really noticed a pattern. The other two times cleared up on their own. One episode was about 3 months ago and the other was about the same time last year. This time it started about 3 days ago. We have only used warm soaks with a washcloth. He has never had it this bad before, but his sister, Rose has, so I brought her into clinic and she was prescribed a cream and it went away in a few days. His right eye is really red and he says he feels like sand is in it. It was a little crusty this morning. The crust was yellowish and I just washed it off with a warm washcloth. His left eye is only a little red. It did not have a crust this morning. He has had a runny nose this week but nothing else."
Question: What information and medical history would be particularly important to obtain from this child?