[Topical photodynamic therapy in basal and squamous cell carcinoma and penile Bowen's disease with 20% aminolevulinic acid, and exposure to red light and infrared light].

Photodynamic therapy (PDT) is a noninvasive selective therapy for a specific group of skin tumors. 5-aminolevulinic acid 20% in a water-in-oil cream base was applied to the tumors as a photosensitizer and was followed after 12 hours by exposure to a high output light source emitting red (585-720 nm; 150 mW/cm2) and near infrared irradiation (1.25-1.