Dry skin or should I call the school?

Sarah

Son came home from school and I noticed his knuckles looked very dry/cracked. Like he had punched a few cement walls…. Hes been acting out alot lately, bullying siblings at home, not staying in the house when told, not coming home after school, but hes always the model student. Hes only gunna be 6 in July, but think its worth calling the school on with just 2 weeks left or leave it to talk with the therapist at next appointment after school is done with? He first said oh I fell I think or I forgot idk, with a goofy smile