For me dairy was anything from animals milk. Eggs are not dairy. Our family (Me, wife and five kids) were going thru 8-9 gallons a week of whole milk, plus every hard and soft cheese you could think of. We home school our kids, and I work from home alot, so the consumption of food at home is very high.
My diet is pretty simple - avoid dairy and anything made from it. Avoid all cheeses. Get fast food without cheese, no pizza, no ice cream, no 'white' salad dressings, etc. Read all labels before eating packaged food to see if it contains milk. It is very hard to buy something packaged at a gas station without it containing dairy. No donuts, no doritos, no cheesy chips. You can have bbq chips though.
For milk alternatives, we switched alot to rice milk, almond milk and coconut milk. They take alot to get used to but it is better than putting water on cereal. I am now dairy free and do not miss it much. (I did attack a pizza 2 days ago for the first time in 4 months). I miss pizza and ice cream the most.
As another benefit, I lost 15 lbs and eat as much or more than ever. Plus, MY BLOOD PRESSURE DROPPED A TON just from not eating dairy. My BP was scary high and required meds for the first time in my life just before this dairy free diet. A couple months after DF (dairy free) my BP was consistently low and normal. It has to be from the lack of dairy, nothing else changed.
Dairy is a major INFLAMMATORY to the body, as is wheat and gluten. This inflammation wreaks havok on the body in many ways including skin problems, blood pressure, migraines, plantar fasciitis, carpal tunnel, weight gain, heart disease, strokes and heart attacks. Our bodies were not meant to consume all the wheat and dairy of the American modern diet. High consumption of carbs (especially refined carbs) is also a major contributor to inflammation.
Another thing I would recommend to anyone fighting multiple ailments (depression, weight issues, inflammation) is to get a food allergy test. MAny doctors do not do this or the test they due are done incorrectly. My wife found a place that anyone can order a test from for $150 shipped to your house, go get a draw of blood, and they test your blood against 100 common foods. My oldest daughter was found allergic to honey and eggs and normal stuff like that. If you are putting things in your body that you are allergic to, the inflammation caused will cause many many problems!!
I dont see how anyone suffering from psoriasis could not read this and not try DF. To me, not eating dairy for a few months to have my skin and self esteem back is a pretty simple trade. Not to mention weight loss and blood pressure normalized naturally.