pyrogallic acid


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pyrogallic acid

(pī′rō-găl′ĭk, -gô′lĭk)

pyrogallol

; pyrogallic acid non-self-limiting, topical, keratolytic/caustic organic acid (also destroys fine nerve endings in skin); formerly used to treat verrucae; application causes a dense black skin stain; prepared as 40% paste in white soft paraffin (WSP) (pyrogallol ointment), or as 20% ointment with 20% wheat germ oil in WSP (WP ointment); Caution: it should be used with caution, i.e. on healthy feet, to a maximum of three consecutive applications, and never on patients with peripheral vascular disease, neuropathy or any other form of reduced tissue viability or compromised healing (e.g. diabetes); can cause haemolysis if applied to wide areas of skin