Daughter has rash!! HELP!!!

Jessie

So a few days ago my daughter came to me saying her hands were burning and itching, she had just washed her hands, I asked her what she used to wash with and she said the one with the little bumps in it lol, so my other child said mom she’s washing her hands with daddy’s face wash, so I just figured she was having a reaction. It kind of faded until today it was raw and really red and dry, she hasn’t used the face wash as I moved it where she can’t reach, so I’m thinking she’s allergic to the soap at school since she did just change to a new school, it’s not only on her hands but also on each arm where it bends in the same exact spots!! Should I call dr or let it go away???