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Ineffective treatment of refractory melasma and postinflammatory hyperpigmentation by Q-switched ruby laser
1Wellman Laboratories of Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston 02114.
Background:
Melasma and postinflammatory pigmentation are cosmetic problems with limited options for treatment.
Objective:
To determine whether selective photothermolysis of pigmented cells by Q-switched ruby laser treatment would produce clinical benefit in these disorders.
Methods:
Eight subjects with melasma or postinflammatory hyperpigmentation refractory to traditional treatments were treated with Q-switched ruby laser pulses (694 nm, 40 nanoseconds) at fluences of 15-7.5 J/cm2, and followed. Histology was obtained before and after treatment.
Results:
Regardless of fluence, no permanent improvement and, in some cases, darkening was seen in each type of lesion. Except for small depression at high fluences in black patients, there were no textural changes after healing. Immediately after treatment, there was epidermal and dermal injury, with extracellular melanin. Several months later, epidermal pigmentation had returned to baseline and dermal macrophages were apparently focally increased.
Conclusions:
The Q-switched ruby laser by itself does not provide an effective treatment for refractory melasma or postinflammatory hyperpigmentation.