Evaluating the Use of Photodynamic Therapy to Treat Facial Cutaneous Squamous Cell Carcinoma in Situ (isSCC)

The goal of this clinical trial is to test how safe and effective it is to treat early form of cancer cells found in the upper skin layer of the face, using a light-sensitive cream used in combination with a light source. The main questions this trial aims to answer are: * to confirm using laboratory testing, how much of the affected facial skin cancer section the treatment was able to remove, and; * seeing how many participants had no remaining affected facial skin cancer sections after treatment. Participants who qualify will be asked to complete 12 visits in total and will receive a total of two treatments, after voluntarily consent has been given.