What is the difference between psoriasis and eczema?

Eczema usually points more toward an irritated skin barrier: itching, dryness, redness, and flares that can come and go with soaps, weather, sweat, or allergens. Psoriasis is more often described as thicker, well-defined patches with silvery scale, commonly on areas like elbows, knees, scalp, or lower back. They can overlap, and some rashes do not read like a textbook, so the safest move is to avoid self-treating a persistent rash for months. If the area is painful, spreading, bleeding, infected-looking, or affecting daily life, a dermatologist can confirm what it is and choose the right treatment.Aaad.org