For the skin problems of your furry, effective on dermatitis, fungi, hot spots... Lapacho or “Pau d'Arco” can be useful in the fight against bacterial and fungal infections. Pau D'Arco is derived from the inner bark of a giant deciduous tree native to the Amazon rainforest in South America. Also known as “Purple Lapacho.” Anti-microbial, anti-bacterial, antifungal, antiviral, antiseptic! Soothes irritation and itching due to dermatitis and various skin problems.