I like to catalog things, so here is a head-to-toe inventory of my psoriasis:
Most of my patches are plaque psoriasis, which consists of lesions (aka plaques) that look like raised red patches of skin covered by silvery scales.
The plaques on my scalp don't bother me much. I don't know exactly how long I've had them, but they probably showed up during high school. When they flake more than I like, I use a shampoo that contains salicylic acid to reduce the scales.
The plaques behind my ears usually also don't bother me, but when they do it ranges from a constant minor itching behind the ears to constant pain from the slightest pressure, including wearing my glasses. I've had plaques behind and around my ears since I was in elementary school, but it's been most bothersome as an adult. Right now I only have a little scaling where my glasses sit near the junction of the top of my ear and my head.
The plaques around my eyes range from a little scale above my eye and below the eyebrows to solid scaling from the eyebrow down, surrounding my eye and covering my under-eye circles. It's mostly a cosmetic irritation -- I use a lot of heavy moisturizers on it -- but when it gets severe, the skin at inside corners of my eyes cracks and it hurts like mad. This was the second area to be affected by psoriasis, first appearing in my early teens.
On my arms, I have patch of plaque psoriasis in the crease of my left elbow. It first appeared as a nickel-sized lesion in July 2005, grew to about 3" diameter and the margins of the plaque have expanded and receded since. Today it's oval-shaped, about 3" long and 2.5" wide. This is one of the more constantly painful plaques and Vogon frequently reminds me not to scratch at it when it's bothering me. I keep a tube of Cetaphil cream at my desk to apply to it.
I have pustular psoriasis on my left hand. It was worst in early 2000 when I was pregnant with Laurel, covering the entire back of my left hand and between my fingers, making the skin between my fingers cracked and painful. Right now it's only on the top of my ring finger and the side facing the middle finger, with pustules from the base of my finger to about the midpoint of its length. It itches most of the time, hurts occasionally, and wearing a ring makes it itch yet more.
I have guttate psoriasis on my lower legs, triggered by a molar abscess last spring. It covered my feet, legs and elbows for a few weeks, shrunk back to just my legs and feet, and now shows up intermittently on my calves, usually when I'm sick. It itches when it's there, spends about a week fading but not itching, and then I forget about it until the next time it shows up.