Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Japanese arisaema (Arisaema japonicum), known as "tian nan xing" in traditional Chinese medicine, has historically been used in East Asian herbal medicine, particularly for external application on ulcerations, abscesses, and other skin lesions. The use is based primarily on traditional herbal compendia, such as the Chinese Pharmacopoeia, which records its topical application—usually after specific processing to reduce toxicity. Ancient texts describe its properties as "resolving phlegm," "reducing swelling," and "dispersing masses," and its use in poultices for chronic ulcers, sores, and skin inflammations. However, the available scientific literature offers little robust evidence for its efficacy or safety in this indication. There are no high-quality clinical trials or controlled studies in modern pharmacological research that validate its effectiveness for external ulcerations. Most data are derived from historical use and anecdotal reports. Additionally, the raw plant contains toxic compounds (notably calcium oxalate crystals), making proper processing essential to avoid irritation or poisoning. In summary, the use of Japanese arisaema for treating ulcerations externally is justified by tradition rather than scientific validation, and caution is advised due to its potential toxicity.

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