Himros was an ointment made from a herb mixture, himros healed first- and second-degree burns and relieved the effects of contact with plants such as nettle, pangwood, and thistle. Its active ingredient was the sap of himros aloe, a water-loving distant relative of aloe vera, native to temperate stream banks and wetlands. It had a cluster of fleshy, dark green leaves with three yellow stripes and rows of toothlike thorns along each edge, which could grow 24" long.