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It is a morbid product in the tree, and yields to hot chloroform 50% of a substance known officially as chrysarobin, which has a definite therapeutic value and is contained in most modern pharmacopoeias.

Pyrogallol is valuable, and is employed in the same manner and strength as chrysarobin.

The British pharmacopoeia has an ointment containing one part of chrysarobin and 24 of benzoated lard.

It is less rapid than chrysarobin, but it rarely inflames the surrounding integument.

In some instances it develops from a long-continued and more or less generalized eczema or psoriasis, and in exceptional cases it is started by the careless use of mercurial ointment and of chrysarobin ointment.