a chronic skin disease characterized by dry red patches covered with scales; occurs especially on the scalp and ears and genitalia and the skin over bony prominences
"After years of struggling with psoriasis, which causes itchy, scaly red patches to flare up on his elbows and knees whenever he gets stressed, John finally found a treatment plan that helped him manage the condition."
A noncontagious disease whose main symptom is gray or silvery flaky patches on the skin which are red and inflamed underneath when scratched.
"After a long day of work, I tried to hide my itchy arms under my sweater so my coworkers wouldn't notice the red, inflamed patches covered in gray scales from my psoriasis."