Why does it feel so good to scratch an itchy patch of psoriasis?
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.
What are endorphins?
Are the endorphins released in the brain, in the skin or somewhere in between?
What else can I do to stop the itchiness?
Endorphins are chemicals (hormones) your body releases when it feels pain or stress. They’re released during pleasurable activities such as exercise, massage, eating and sex too. Endorphins help relieve pain, reduce stress and improve your sense of well-being.

Endorphins are created in your pituitary gland and hypothalamus, both located in the brain. Endorphins are a type of neurotransmitter, or messenger in your body. They attach to your brain’s reward centers (opioid receptors) and carry signals across your nervous system.

To relieve the itching try using a moisturizer.
Applying a moisturizing cream or ointment after every hand washing, bath, and shower helps to seal much-needed moisture into your skin. Moisturizer helps reduce the redness and the itch. It also helps your skin heal.