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Patients generally not suitable for any form of light treatment are those who have a history of skin sensitivity to light or scarring problems, an active herpes (cold sores) infection or other skin infections such as impetigo at the site to be treated.
Darker skin, or recently tanned skin, may be not be suitable for treatment by certain types of machine. Your practitioner will advise you about this if you have a darker complexion.
Patients who have used isotretinoin in the last year would also not be suitable candidates.