I have dealt with this on and off for decades. Right now it's in remission.
Eczema, seborrhea and psoriasis are common autoimmune disorders of the skin. The only one that I have not yet contracted is psoriasis (thank God)
Since you get steriod shots weekly, I am assuming you see doctor. And in that case, you should really find out as much as you can from him.
I've had this problem all my life. Protopic ointment used at night has made a huge difference for me. Try to find a good dermatologist... most docs don't get chronic eczema at all! Hang in there... I know how frustrating it is.