Eczema is a general term for any type of dermatitis or “itchy rash”. There are several skin diseases that are eczemas; a partial list of eczemas includes: atopic dermatitis, contact dermatitis, dyshidrotic eczema, nummular eczema, seborrheic dermatitis. All types of eczemas cause itching and redness and some will blister, weep or peel.