Pyrogallic Acid is of use in acne, but produces a discoloration of the skin.

Eugallol and Lenigallol, acetates of pyrogallic acid, have been advised as substitutes of pyrogallic acid in psoriasis and acute and chronic eczemas.

Pyrogallol, 2 grains (0.12 Gm.), is used in internal hemorrhage. As an ointment, I dram to 1 ounce (4.0-32.0 Gm.), it is palliative in psoriasis, and it is also beneficial in lupus and epithelioma.

Gallanol, the analid of gallic acid, is a bactericide, and is useful in psoriasis in the form of a powder or in an ointment (1 to 30). It is also used in alcoholic solutions of 10 per cent. strength. It relieves the pruritus of chronic eczema. In favus and trichophytosis a mixture is used consisting of gallanol 10 parts, ammonia I part, and alcohol 50 parts.

Gallicine, methyl ether of gallic acid, applied in finely divided form with a brush, is a benefit in keratitis and conjunctivitis, as well as in eczema of the eyelids.