Causes and Diagnoses
Causes and Diagnoses of Psoriasis
The precise cause of psoriasis isn’t known, but it’s related to a malfunction of the immune system that causes skin to grow and shed at an abnormally fast rate. There is a genetic component to psoriasis, which means if you have it, there’s a good chance someone else in your family has psoriasis as well. Psoriasis is not contagious.
Many types of psoriasis have a trigger that sets off an episode. They include:
- Strep throat
- Respiratory infection, earache or bronchitis
- Cold, dry weather
- A cut or scratch
A diagnosis of psoriasis usually involves a physical exam and discussion of your symptoms and family history. If necessary, a biopsy (tissue sample) may be taken for examination under a microscope if there’s a question of whether an outbreak is psoriasis or eczema.