- Koebner phenomenon plaques are just like regular psoriasis flare-ups. They can be: Raised
- Red
- Scaly
- Itchy or painful
They can also crack and bleed. In most cases, worse injuries mean more plaques. Unlike regular psoriasis flare-ups that show up on knees, elbows, the scalp, and the lower back, Koebner phenomenon plaques can happen anywhere your skin has been hurt