Spanish Needle (Bidens pilosa) has a long-standing history of use in traditional medicine across various cultures, particularly in Africa, Asia, and the Caribbean. It is commonly employed for a range of skin conditions, including itching and rashes, often in the form of poultices or topical washes made from the leaves and stems. Ethnobotanical surveys frequently report that local healers recommend Spanish Needle for relief of pruritus (itching), sometimes attributing this effect to the plant’s purported anti-inflammatory and antimicrobial properties.

Scientifically, there is some preliminary evidence indicating that Bidens pilosa possesses anti-inflammatory and antioxidant activities, based on in vitro and animal studies. Certain phytochemicals present in the plant, such as flavonoids and polyacetylenes, have demonstrated anti-inflammatory properties that could theoretically help reduce skin irritation and itching. However, direct clinical studies confirming efficacy for itching in humans are lacking. There are no robust clinical trials or systematic reviews that specifically validate its use for itching, and the available scientific evidence remains limited to laboratory and animal research.

In summary, the use of Spanish Needle for itching is primarily supported by traditional practices and anecdotal reports, with only modest indirect scientific support. More rigorous clinical research would be necessary to confirm its safety and effectiveness for this specific use.