Evolution of Technology

Photodynamic Therapy

Photodynamic therapy is a type of treatment that uses a light sensitizing medication put on the skin or into the bloodstream, which is then activated by light from a laser or other light sources, to kill the desired cell type, most often cancer and precancer cells.

Evolution of Procedure


Cryotherapy (use of liquid nitrogen) is probably the most familiar treatment. However, only lesions that are felt or seen are treated. There are many topical medications that can be used for treatment. This is typically done when there are numerous lesions or recurrence is frequent. Some disadvantages of topical medication are the duration of treatment and the side effects (redness, swelling, crusting of the skin), both of which can lead to noncompliance.