Abstract
In an attempt to avoid the side-effects of treating solar keratoses with 5% 5-fluorouracil (5-FU) ointment, a new pharmacological varnish containing 5% 5-FU and 5-10% salicylic acid to collodium was tried. Twenty patients with such lesions were treated. A drop of the varnish was applied on each lesion every 3 weeks. Only one to five applications on facial lesions were necessary to obtain apparent cure in all patients. Lesions reappeared in four patients, but were cured after a second and similar treatment. The keratoses of the hands were more resistant and needed seven applications in one patient and nine in the other.

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