Moss, particularly species like Sphagnum moss, has a long history of traditional use in treating external ulcerations and wounds. Historically, indigenous populations and early European medical practitioners utilized moss as a wound dressing due to its high absorbency, mild antibacterial properties, and soft texture. During World War I, sphagnum moss was widely used as a surgical dressing when cotton was scarce. Its natural acidity and ability to retain moisture made it suitable for keeping wounds clean and promoting healing. While these traditional uses are well documented, there is limited direct scientific evidence supporting moss as an effective modern treatment for ulcerations. Most of the support rests on anecdotal reports and historical practices rather than rigorous clinical trials. The mild antibacterial effect is attributed to the acidic environment moss creates, which may inhibit some bacterial growth, but this effect is modest compared to contemporary wound care products. In summary, the use of moss for external ulcerations is primarily justified by historical precedent and traditional medicine. Modern medicine has largely replaced moss with more effective and standardized wound care materials. However, the traditional use of moss as a dressing illustrates the resourcefulness of past medical practice and the potential value of natural materials in emergency or resource-limited settings.