The use of ash (from wood or other plant materials) to treat scratches and abrasions is primarily rooted in traditional and folk medicine practices. Historically, various cultures have applied ash to minor wounds, believing it to have antiseptic or drying properties. The rationale was often based on ash's alkaline nature, which was thought to create an environment less hospitable to microbes, and its ability to help dry and scab wounds.

However, there is little to no scientific evidence supporting the efficacy or safety of ash for treating scratches and abrasions. Modern medical literature does not recommend ash for wound care, and there are concerns about potential contamination or introduction of pathogens from non-sterile ash. Some studies on traditional medicine note its historical use, but scientific validation is lacking. The rating of 1 reflects the presence of tradition, but an absence of controlled studies or clinical trials to substantiate its effectiveness or safety.

In summary, while the use of ash for minor wounds exists in historical and ethnobotanical records, it is not supported by modern scientific research and is generally discouraged in favor of evidence-based wound care practices.