Kanka
Encyclopedia
Kank-A is a liquid pharmaceutical product marketed by Blistex
Blistex
Blistex was a small family company in 1947. Its focus was to develop and market lip care products in the United States. It then became a private company based in Oak Brook, Illinois that primarily manufactures lip balm, lip ointment, and other lip-related products...

 used primarily to treat canker sores. It is applied directly on the sore and works by numbing the local area (with benzocaine
Benzocaine
Benzocaine is a local anesthetic commonly used as a topical pain reliever, or in cough drops. It is the active ingredient in many over-the-counter anesthetic ointments...

) to prevent discomfort and forming a protective mucous barrier with a compound benzoin tincture
Tincture of benzoin
Tincture of benzoin is a pungent solution of benzoin resin in alcohol. A similar preparation called Friar's Balsam or Compound Benzoin Tincture contains, in addition, Cape aloes and storax .-Medical uses:Tincture of benzoin has two main medical uses: as a treatment for damaged skin in the...

that protects the ulcer from further irritation, allowing it to heal more rapidly.
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