A 23-year-old woman developed allergic rhinitis in 1993. Her doctor pr
escribed for her Solfa (amlexanox 25 mg) and Lysozymen 90 (lysozyme ch
loride 90 mg) tablets. She took the tablets occasionally, whenever she
developed allergic rhinitis. She noticed a macular erythema of about
3.5 cm wide on her buttocks in 1994, about 1 year after the initial pr
escription. We conducted a series of tests with the tablets. On patch
testing, the patient had a positive reaction to Solfa 50% pet. on the
eruptive area, but no such reaction on the non-eruptive area. Furtherm
ore, on patch testing, she had no reaction to Lysozymen 90 50% pet. on
either the eruptive or the non-eruptive area. We also used open appli
cation test with Solfa 50% pet. to confirm the cause of her erythema.