I let my son stay at his grandparents on his dad side and went to pick him up from them and he broke…

I let my son stay at his grandparents on his dad side and went to pick him up from them and he broke out in hives, had a scrape under his nose (and not a pretty one) and a cut on his arm! Asked what he got into the the broke out...said they didn't know...asked how he got the scrap on his nose...they didn't know...and the cut...well because we was playing with a fork 😑😑 not a happy mom right now! 😡