Dithranol and
chrysophanic acid are therapeutic substances in araroba powder that are responsible for success in treatment of
psoriasis and chronic
eczema. It has been used as a treatment of
ringworm. Generally, when used for skin conditions, the powder is mixed into a zinc or petrolatum
ointment,
paste, or
cream base to contain it to the treatment area. The
British Pharmacopoeia lists an ointment containing one part of chrysarobin and 24 parts of
benzoated
lard. ==Pharmacology==