What's this?
a first aid kit
What are these?
germs
What's the matter with him?
He has a broken leg / bone.
What's the matter with her?
She has an earache.
What's the matter with her?
She feels dizzy.
What's this?
a cast
What's this?
bruise
What's this?
a scratch
What's this?
a plaster
What's the matter with her?
She has a cold.