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.
Psoriasis Definition and Symptoms. Psoriasis is a skin disorder that causes the life cycle of skin cells to be altered, making them build up rapidly on the surface of the skin forming thick, itchy, scale like patches. Common types of psoriasis are scalp, nail, plaque, and inverse.Symptoms include red patches, dry skin, cracked skin, itching, burning, swollen joint, and silvery scales.ommon types of psoriasis are scalp, nail, plaque, and inverse. Symptoms include red patches, dry skin, cracked skin, itching, burning, swollen joint, and silvery scales.