Psoriasis and psoriatic arthritis are chronic diseases (known together as psoriatic disease) related to the immune system. These diseases can start at any age. About 1 in 3 people living with psoriasis also have psoriatic arthritis. When you have psoriatic disease, your immune system is overactive and causes inflammation in your body. There may be visible signs of inflammation such as plaques or scales on the skin. The inflammation can also be less visible and can impact other organs and tissues in the body, such as your joints. A comorbidity is a disease or condition related to a health condition you have, such as psoriasis.
A health care provider will take several factors into consideration when making a diagnosis of psoriasis or psoriatic arthritis including:
- The appearance of the skin. (Psoriasis may look different depending on your skin color.)
- The location of psoriasis.
- Itch of the skin. (Psoriasis)
- A skin biopsy. (Psoriasis)
- Morning stiffness or stiffness after resting. (Psoriatic arthritis)
- Nail changes. (Psoriatic arthritis)
- Swelling of whole fingers or toes. (Psoriatic arthritis)
- Asymmetric joint symptoms. (Psoriatic arthritis)
- Enthesitis (pain and swelling in the area where the tendon or ligament connects to the bone). (Psoriatic arthritis)
Definition of psoriatic disease (psoriasis and PsA and comorbidities)
Factors towards diagnosis (psoriasis and PsA)