In Washington, scientists are exploring why scratching an itchy spot, like a bug bite, often seems to make it feel better but actually worsens the condition. This is important because it might help us understand how to prevent skin damage.
Itchiness can be caused by many things, including certain diseases. Doctors warn that scratching can harm the skin. Researchers have studied this by observing mice to see what happens in the body when an itch is scratched. They used small protective collars on mice to examine the effects without scratching.
They learned why scratching feels good at first. It’s not just humans; even fish scratch, hinting at an evolutionary reason, possibly related to protecting against germs. However, this isn’t an excuse to scratch.
Dr. Daniel Kaplan, a skin expert from the University of Pittsburgh, looked into a common irritant-caused itch called allergic contact dermatitis. This is triggered by things like poison ivy or metals in jewellery. His research applied an irritant to mice, causing itching and increased immune response and swelling. Mice unable to sense itching reacted less.
Mice with collars, unable to scratch, had less swelling, showing the impact of scratching. Kaplan explained that, like with mosquito bites, if you scratch it, you risk making it last longer and become more swollen.
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