Otzi was carrying birch polypore, which is used in traditional medicine. The surface "skin" can be used as a basic sticking plaster and it is chemically poisono

Otzi was carrying birch polypore, which is used in traditional medicine. The surface "skin" can be used as a basic sticking plaster and it is chemically poisonous to whipworm. Based on this article though I wonder if it was being used for antibacterial properties.