It happened at home, I was not in room - don't leave dc alone with carers generally.
dc has challenging behaviour sometimes needs restraint - carer did not mention episode had happened even when asked.
carer is well trained & we've had professional relationship for over 18 months - had no concerns until now.
dc behaving strangely when I returned (5-10 mins) - distressed/angry/attention seeking. Only other time I have ever seen dc act like that was when family member lost temper & smacked dc (no longer have anything to do with them).
dc has limited understanding & can not answer questions (echolalic)- but some expressive language. Said 'X hurt'
Had a red mark on arm & hand but that could be anything
Will not leave dc alone with any carer ever again.