skin rash deckt mE ein weites Spektrum ab ...

Danke no me bre

Simply "rash" will also do very nicely in this sentence talking about redness and inflammatory changes in the skin.

If I touch a stinging nettle, I may get a rash - but not eczema.

eczema [med.]der Hautausschlag nicht fachsprachlich
Dictionary: Hautausschlag

I would be very wary of using "eczema" in English unless you are sure it is eczema and not any other of myriad rashes.

@Marianne: You are the expert. Would you object to calling "Hautausschlag" a dermatitis?
Wikipedia says:
An eczema diagnosis often implies atopic dermatitis (which is very common in children and teenagers) but, without proper context, may refer to any kind of dermatitis.

Rash is not a specific diagnosis. It's a general term that means skin inflammation that changes the way skin looks and feels--including eczema, poison ivy, and heat rash. Rashes can be caused by toxins, microorganisms, even stress, I think.

@#7. Hi Reinhard W.
"Hautausschlag" is as non-specific as "rash" (or "skin rash", if you must). In both languages it applies to skin involvement in infections as well as a whole range of primary and secondary skin diseases.

"Ekzem"/"eczema" may be used generally in both languages as a lay term for inflammatory skin conditions - not infections - but I would reserve it for cases I actually knew to be atopic dermatitis/eczema.

"Dermatitis" is often used synonymously with "eczema" in English but, again, that is a generalisation in lay terms. On the basis of meaning "inflammation of the skin", "dermatitis" could refer to most rashes, but it isn’t used that way – I would keep it for instances such as types of dermatitis and specific cases such as "contact dermatitis", "seborrhoeic dermatitis" (cradle cap), atopic dermatitis (eczema) etc.

For measles or chicken pox, for example, or Spike's urticaria, you would definitely say a rash and not dermatitis or eczema.