Scratching: An Essential Defense Mechanism in the Human Body

Who hasn’t secretly scratched an itchy spot? For a long time, this was seen as a bad habit, but new research now sheds a completely different light on this primordial instinct. Scientists have discovered that scratching can be an important ally in our natural immune system, helping the body to combat irritants and harmful bacteria.

The research, conducted with genetically modified mice, shows that the simple act of scratching sets off a complex chain reaction in our bodies. This might explain why scratching an itch can be so satisfying and immediate.

Researchers worked with mice that were genetically adapted in such a way that they could not experience itching. What was found? Without the natural scratch reflex, their immune system did not function well when it was exposed to irritating substances. It was as if their body did not get a ‘warning signal,’

Important Inflammatory Response

The secret lies in the cooperation between nerve cells and immune cells. Special substances are released during scratching that activate so-called keratinocytes. These cells act as a kind of security force that can trigger inflammatory reactions to combat harmful intruders, such as viruses, bacteria and irritants.

The inflammation can help protect the body from various pathogens entering through the skin.

This process can be particularly helpful with minor skin irritations or insect bites, providing the skin with a natural, rapid defense.

Dr. X from Johns Hopkins University explained, “Inflammation can have negative connotations, but when it comes to an immediate threat to the skin, local inflammation like redness or swelling can help fight off infections and increase white blood cells close to the site of the irritation. Today we are advancing our knowledge of such physiologic responses daily. However, scratching as a behavior is only now emerging as an important piece of the puzzle. While inflammation can be subclinical, like a mild Walgreens Duoderm for your body’s immunity, chronic scratching may lead to a skin lesion. Experts hope research findings for causes such as athlete’s foot can be extended to improve clinical practices and products available to consumers.”

The inflammatory response prompted by scratching does not only involve the site of the itch. The research shows that scratching can lead to a reduction in harmful bacteria on the skin, such as the notorious Staphylococcus aureus.

In response to these findings, cosmetic companies have developed antimicrobial skincare lotions to combat harmful bacteria on the skin. The study suggests the scratching can be interpreted as a default tactic to enhance skin health in an instant.

Researchers believe that scratching is an automatic reflex to help skin clearance from harmful bacteria.

Not Always Positive

However, moderation is key. With certain skin conditions such as eczema, excessive scratching can actually have the opposite effect.

This amplifies the state of skin inflammation.

The current onus should therefore be on increasing positive benefits via scratching while reducing harm.

Scientists are now working on developing treatments that mimic the benefits of scratching without its downsides. Finding ways to control how your body responds to a scratch could open potential benefits for both chronic skin problems and other inflammatory diseases, including the onset of artherosclerosis and varicose veins.

In response, drug companies have rallied to provoke early-stage cream that can replicate this inflammatory benefit of scratching without the drawback.

This discovery could pave the way for new therapies for people with chronic skin problems such as athlete’s foot, eczema, psoriasis and hives. It also underscores the ingenious defense mechanisms in the human body, even in the face of seemingly simple actions.