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Whitfield's Ointment is salicylic acid and benzoic acid in a suitable base, such as lanolin or vaseline.
The original ointment contains 3% salicylic acid and 6% benzoic acid, but other ratios are also used.   
- Lionel Fry, An atlas of dermatology
- Whitfield Ointment
- Electronic Textbook of Dermatology, Common Dermatologic Diseases
- Gooskens V, Pönnighaus JM, Clayton Y, Mkandawire P, Sterne JA (October 1994). "Treatment of superficial mycoses in the tropics: Whitfield's ointment versus clotrimazole". Int. J. Dermatol. 33 (10): 738–42. doi:10.1111/j.1365-4362.1994.tb01524.x. PMID 8002148.
- http://www.merriam-webster.com Whitfield's ointment