Hey everyone. I actually market a drug (which I won't name) that treats moderate to severe psoriasis. I don't personally have it, but I've met many people which my drug treats, and how it's changed their lives. People would rather stay home for months on end, rather than be seen in public with the mass scaling and rashes.
Before I started working on this drug, I never realized that psoriasis is actually an autoimmune disease, and it's cause by your skin regenerating faster than it needs to, which exposes raw skin, rashes.
Some topicals work for people who don't have severe cases, but for those who suffer from moderate-to-severe (about 800K in the US), other treatments are available if you just talk to your dermatologist. I'll try to answer any other questions that people may have on this subject.
One thing to consider when reading about the side effects, it is the pharmaceutical company's obligation as directed by the FDA to report ANY side effects patients report. While some may sound severe, they may have been experienced by just a hand full patients out of hundreds of thousands.