[Investigation of contact allergies in 100 cases of ulcus cruris (author's transl)].

In a group of 100 patients with ulcus cruris, the incidence of contact allergies was determined. Patch tests were applied with 18 products that might have come into contact with the skin. These products comprised drugs and excipients (preservatives and ointment vehicles) potential ingredients of tapes or of elastic bandages. Peru balsam (14%), wool-wax alcohols (10%), Nestosyl owing to its para-aminobenzoate component (7%), neomycin (5%) and Thyme oil (5%) were the allergens most frequently encountered.