Psoriasis and psoriatic arthritis are immune-mediated diseases. This means that an overactive immune system plays a role in these conditions.

In people with psoriasis, the immune system causes the skin to overproduce skin cells, leading to the formation of raised dry patches on the skin. The resulting systemic inflammation means that the condition can affect other organs and tissue. When it affects the joints, it is known as psoriatic arthritis.

Not everyone who develops psoriasis will also develop psoriatic arthritis. However, the conditions are connected, and doctors group them under the term “psoriatic disease.”

This fact-or-fiction quiz will test a person’s knowledge of psoriasis and psoriatic arthritis.