What is the difference between psoriasis and eczema?

What is the difference between psoriasis and eczema? I have a patch of dry scaly red skin on my thigh that is itchy. How can I tell if it is psoriasis or eczema?

Psoriasis Alternative Treatment Options – Looking Beyond The Doctors Surgery

Psoriasis Supplements and Exercise for Psoriasis Treatment

Psoriasis- what it is and how to live with it

Psoriasis Free For Life Review- Best of the Best

Scalp Psoriasis Treatment Facts, Information, and Tips

Treating Psoriasis With Emu Oil

Treating Psoriasis Naturally – How to Get Rid of Your Psoriasis Today

Coping With Psoriasis And Treatments

Psoriasis treatments at the Dead Sea – what they entail