What Is This Thinning On My Hair!( 7 Words!!!!!)

[MrPortugal]

Hey guys, my hair is thinning all over the head and this Itchy and dandruff(SD) like a hell, I have eczema and my body Itchy too(pubic area is shedding too, armpits, chest, legs and the butt.
My old post

https://www.hairlosstalk.com/interact/threads/sides-of-my-head-and-back-is-thinning.100327/

First I thing I had retrograde alopecia, but I don't know.
Somebody know what is this??
Sorry for my english
Thanks