mine my backside very itchy,keeps scratching until very red
and have sores,another is the feet,very itchy and smells
bad
That one not Eczema liao.. Places where always moist/wet it
fungal... SAF foot powder should work for your case, if not just
apply fungal cream...
Eczema use SAF foot powder or Prickly Heat powder for heat rash
and or anti fungal cream will get worse...
Anti fungal cream kill fungal and dries the skin, dry skin makes
eczema worse..
Fungal infection if u moisturize also gets worse
Read about the difference: http://www.eczema.com.au/articles/67-is-eczema-a-fungus/
But eczema if never treat properly can become eczema with fungal
infection..
Eczema:

Ringworm
(Fungal, army time very common)

Athlete's Foot
(Fungal, foot area)

Jock itch
(Fungal usually near private parts)

Tinea
(Fungal)

Herpes (Viral,
usually sexually transmitted)

My arm early this week was worse then this:

Eczema the itch one kind one, other rash u feel the itch u
scratch the surface of skin of liao.. Eczema u scratch the surface
no feeling one, the itch like under the skin one, so u tend to
press harder when scratch.. It scratch too much a clear liquid will
ooze out, when that clear liquid dries, it itch even more... If u
never touch and bare with the itch, then when healing that time
skin will be flaky and dry, that dry flaky skin itch like hell
one.
The itch difficult to describe, only when u have it then u
know.. Its an itch that can make u wake up from deep sleep just to
scratch
Lucky i have very very short fingernails