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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. These conditions should be individually assessed and treatment may continue where the underlying condition is addressed.
Darker skin-types may be treated but all risks outlined above increase with the darkness of the skin. For example, it may not be helpful to remove a black tattoo from dark skin and leave in its place a light patch with the same shape.
Recently tanned skin should not be treated. Active melanocytes (the cells which produce melanin) are readily targeted by Q-switched lasers and the damage done is likely to lead to long-term hypopigmentation (pale patches of skin).
Patients who have used isotretinoin – a powerful photo-sensitiser - in the last 12 months would also not be suitable candidates.