My first "guess" would have been some type of herpes virus. However, since you were diagnosed with a form of eczema, the herpes could be ruled out... maybe.

"Too much heat and moisture in the body"??

Was he kidding? The body is 75% water, and a steady 98.6 degrees...

The truth is that eczema is caused by organisms, most likely a fungi, and can be eliminated by using some natural antifungal creams, such as olive leaf and D3, and by going on the phase one diet for at least 30 days. (No simple sugars or grains)

__________________
Let Food Be Your Medicine And Medicine Be Your Food.(Hippocrates)

Oh. So much for my theory.
I was going to suggest lemon juice or vinegar. The lye in concrete is like a powerful soap--and it dries skin out to the point it cracks and bleeds. Washing with an acid counteracts the base, just like we were taught in high school chemistry. In any case, I am glad to see you got it figured out.