It’s not known exactly what causes psoriasis, but researchers have some ideas, including:
Immune system not working as it should
- Normally, skin cells divide and replace themselves about once a month. Most people don’t even know it’s happening.
- In people with psoriasis however, the immune system causes new cells to be created almost 10 times faster than normal.
- As a result, the extra skin cells build up forming raised, scaly patches.
- Psoriasis appears to run in families. In fact, a child with one parent who has psoriasis has a 10-25% chance of developing it too.
Other existing conditions
- Psoriasis may share parts of genes that are linked to other conditions. This may explain why people with psoriasis may also have other health conditions.