A double-blind, controlled multi-centre trial with 238 patients was employed to study the relative merits of three treatment schedules in acne vulgaris. Schedule A consisted of oral oxytetracycline and topical vitamin A acid cream (0.05%), schedule B of oral oxytetracycline alone, and schedule C of vitamin A acid alone. Large and statistically significant reductions occurred in the number of come dones, papules and pustules during 8 weeks of therapy, which could be attributed neitherto placebo effects nor to natural history of the disease.
After cobalt-60 therapy 3 patients developed open and closed comedones in the face corresponding to the treatment fields. Biopsies showed extensive dermal elastotic material. It is suggested that the elastotic fibres may contribute to a change in the supporting function of the dermis and a secondary sebum retention and comedo formation.
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