To the Editor.—
Tincture of benzoin consists of 10% benzoin in alcohol, while compound tincture of benzoin contains 10% benzoin, 2% aloe, 8% storax, and 4% tolu balsum in alcohol. In the last ten years there have been three reports in the English literature of allergy to tincture of benzoin or compound tincture of benzoin.1-3 I report two cases of contact dermatitis that were due to tincture of benzoin.
Report of Cases.—Case 1.—
A 39-year-old man was seen on Feb 20,1967 because of an erythematous, eczematous eruption of four days' duration that involved the perianal area, the buttocks, and the back. One day prior to the onset of the eruption, his family physician treated him for pruritus ani by painting the perianal area with Castellani's paint (a mixture containing fuchsin, water, boric acid, acetone, resorcinol, and phenol). A diagnosis of contact dermatitis with an id reaction was
Coskey RJ. Contact Dermatitis Owing to Tincture of Benzoin. Arch Dermatol. 1978;114(1):128. doi:10.1001/archderm.1978.01640130086037