Breaking the Itch-Scratch Cycle: Understanding the Risks of Scratching and How to Find Relief
Scratching an itch may feel good, but it can actually make things worse. Researchers have found that scratching an itch can lead to a cycle of more itching and scratching. A study on mice wearing "cones of shame" revealed that scratching can increase inflammation and swelling at the site of the itch.
Dr. Daniel Kaplan and his team at the University of Pittsburgh studied allergic contact dermatitis in mice. They found that mice with defective itch-sensing nerve cells had milder rashes compared to normal mice. When normal mice were prevented from scratching, they had less swelling and fewer inflammatory cells at the site of the itch.
Scratching can trigger the release of compounds from mast cells, which can worsen allergic reactions. Substance P, a chemical released by pain-sensing nerve cells, can activate mast cells and further inflame itchy rashes or bug bites. While scratching may provide temporary relief, it can ultimately make the itch worse.
Despite some potential benefits of scratching, such as sloughing off parasites or fighting off bacteria, the overall advice is to avoid scratching. There are treatments available for itchy skin conditions, including antihistamines and other drugs that target the pathways linked to scratching. Dermatologists recommend using anti-itch balms and menthol-containing creams to alleviate itchiness without scratching.
Understanding the mechanisms behind itching and scratching could lead to better treatments for skin diseases like chronic eczema. By breaking the itch-scratch cycle, individuals can find relief from itching without causing further damage to their skin. It's important to resist the urge to scratch and seek appropriate treatments for itchy skin conditions.