Has he been to Hospital yet, SOunds really bad and he has no defence agains foreign bodies and pus means infection, the doctors will get the infeciton under control and i dont know what else because there may be different to what the do where i am, All the best to the little bub :(

This has helped my son with his Eczema when he has a bad flare up I wrap the areas affected with cold wet clothes and that stops the inflammation and the itch.

try using pure unrefined shea butter on him it works well on me and kids.

This is very heart breaking, what did the doctors do for him? Is he on any type medication? I never have heard of it being that bad, poor baby, many prayers for him.

I've been that bad and my advice is to get referred to another derm quick because the child is infected & may need to go into hospital and take antibiotics to get the infection under control to give the skin a chance to heal.
In the absence of a derm, bath the child in warm saltwater ( sub-seawater concentration, slightly stinging but not so strong as to irritate) or QV-flareup (or Oilatum Plus) twice day to help clear the infection. Keep the child reasonably cool and calm (!) and cover non-weepy areas with soothing bland moisturizer or vaseline. As the infection clears the skin will begin the heal and clam down, while the moisturizer will help keep the bacteria out of the deeper skin layers.