Need help with sons skin

I need help. My 3 month old son has red patches of incredibly dry skin between his eye browns, middle of his forehead, hair line, and now it's moving to his cheeks. We've been battling this since he was about 6 weeks. We have tried all baby lotions, baby oil, coconut oil, a and d ointment. I'm just at loss. Eczema and psoriasis run in the family. He goes to the doctor the 22 for his 4 month check up. Didn't know if any other moms have delt with this and what worked for you! Tia.