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How does the operator know at which energy levels to treat in the absence of pain or erythema?

April 26, 2017energy erythema levels operator pain treat

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How does the operator know at which energy levels to treat in the absence of pain or erythema?

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Slight erythema around the hair follicles is observed shortly after each pulse. But it disappears after a few minutes. This is the signal for effective treatment. Skin tests should be performed before treatment as in any laser treatment.