Help! Psoriasis or Eczema?

Hi everyone! Happy Easter!

This type of rash I'm not sure of if its psoriasis or just eczema? It started out like a ring. So I thought its ringworm but I doubt it now. It's our lo's visit to pedia on Tue. I just thought anyone has insights on this type of rash? Location btw is right upper chest and solitary. Thank you all!