Scratching the skin can provide temporary relief from the symptoms of psoriasis, such as itchiness and discomfort. This is because when you scratch the affected area, you stimulate nerve endings in your skin that send signals to your brain. These signals are interpreted by the brain as pleasurable or satisfying, leading to a sense of relief and pleasure.

Scratching may also release chemicals called endorphins, which are natural painkillers produced by the body. Endorphins help to reduce pain and improve mood, further contributing to the feeling of relief that comes with scratching.

However, while scratching may provide short-term relief, it can actually make psoriasis worse over time. Constant scratching can cause the skin to become thickened and inflamed, making psoriasis more difficult to treat. Additionally, scratching can lead to injuries on the skin, increasing the risk of infection. It's important for people with psoriasis to try to manage their urge to scratch and avoid triggers that worsen their condition.
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