This is a method in which a photosensitizing compound is given and this accumulates in certain target cells which mostly are cancerous cells followed by irradiation of the lesion with visible light. The combination of the two destroys the abnormal cells resulting in destruction of tissues. Other Lasers- gold vapor laser, copper vapor laser pumped dye laser, neodymium YAG laser. Adverse effects Stinging sensation, burning pain, itching on light exposure.
Pain can be present for many hours.
Severe reactions Blistering, ulceration and necrosis can occur.