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.
It can pop up as a single patch or several, and can even affect your entire scalp. It can also spread to your forehead, the back of your neck, or behind your ears. You canât catch scalp psoriasis from another person. As with other types, we donât know what causes it. Doctors believe it comes from something wrong with your immune system that causes skin cells to grow too quickly and build up into patches. You may be more likely to get scalp psoriasis if it runs in your family.