# Psoriasis: Your GoodRx Guide - Author: **Sarah Gupta** - Document Tags: [[psoriasis]] - [URL link](https://www.goodrx.com/conditions/psoriasis)  ## Highlights - Psoriasis is an [autoimmune skin disease](https://www.goodrx.com/health-topic/autoimmune). This means that the body’s immune system is overactive and causes damage and inflammation. When you have psoriasis, your immune system also makes your [skin cells](https://www.cdc.gov/psoriasis/index.htm) grow faster than normal. This can lead to [thick, itchy, or painful rashes](https://www.psoriasis.org/about-psoriasis/) anywhere on the body. Psoriasis is [*not* a contagious disease](https://www.jaad.org/article/S0190-9622%2815%2901814-9/fulltext). ([View Highlight](https://read.readwise.io/read/01hmpremjfwh1s49pjdyasvfqd)) --- - several [types of psoriasis](https://www.psoriasis.org/locations-and-types/?gclid=CjwKCAjw_o-HBhAsEiwANqYhp8RnWXGlSpjWP_q_y57-2GTEbhLzVT3OEBfMUxFPAH2igntQ-xkTKRoCtPwQAvD_BwE), ([View Highlight](https://read.readwise.io/read/01hmpret31we51e2kny5t03m2k)) --- - **Plaque psoriasis:** Patches of thick, colored, raised skin (called plaques) with a flaky coating. This is the [most common type](https://pubmed.ncbi.nlm.nih.gov/32427307/) — it affects up to 80% of people with psoriasis ([View Highlight](https://read.readwise.io/read/01hmprf4ntq14nz1ks19g9s4cq)) --- - **Guttate psoriasis:** Tiny red bumps, usually on the chest and back. ([View Highlight](https://read.readwise.io/read/01hmprg0zjh1q4zxqrxhk73g9n)) ---