Ninety-five patients with acne were treated with 1,200 r of Grenz ray therapy in divided doses of 200 r each. After six months of follow-up, no significant improvement was noted. Increased pigmentation was a hazard encountered, especially in darker-skinned individuals.
WRIGHT WL. Grenz Ray in the Treatment of Acne Vulgaris: Controlled Study. Arch Dermatol. 1964;89(3):417–418. doi:10.1001/archderm.1964.01590270103023
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