A threshing floor in Santorini in Greece. Russian women using a hand powered winnowing machine in a barn. Note the board across the doorway to prevent grain from spilling out of the barn, this is the origin of the term threshold.
Psoriasis is not contagious. It is not something you can âcatchâ or that others can catch from you. Psoriasis lesions are not infectious and cannot be passed from person to person.It is okay to have contact with people who have psoriasis.t is not something you can âcatchâ or that others can catch from you. Psoriasis lesions are not infectious and cannot be passed from person to person. It is okay to have contact with people who have psoriasis.
Several types of psoriasis exist. These include: 1  Plaque psoriasis. 2  The most common form, plaque psoriasis causes dry, raised, red skin lesions (plaques) covered with silvery scales. 3  The plaques itch or may be painful and can occur anywhere on your body, including your genitals and the soft tissue inside your mouth.