Clinical evaluation in acne.

Area of Science:

• Dermatology
• Clinical Research Methodology

Background:

• Clinical evaluation of acne vulgaris treatments lacks standardized, sensitive methods.
• Lesion counting is more reliable than patient opinion or photographic assessment for evaluating treatment efficacy.
• Photographic assessment shows low correlation and reproducibility in acne studies.

Purpose of the Study:

• To compare the efficacy of oral zinc sulphate versus placebo in treating acne vulgaris.
• To assess the sensitivity and reproducibility of different clinical evaluation methods for acne treatment.

Main Methods:

• A 6-week, double-blind, placebo-controlled study involving 54 patients.
• Comparison of 0.6 g daily oral zinc sulphate against a placebo.
• Clinical evaluation using lesion counts and a scoring system.

Main Results:

• Oral zinc sulphate treatment led to approximately a one-third improvement in acne.
• Zinc sulphate showed a statistically significant improvement (p<0.05) compared to placebo.
• Inflammatory acne (grades 2-3) responded better to zinc treatment than comedonal acne.

Conclusions:

• Oral zinc sulphate is an effective treatment for acne vulgaris, especially inflammatory types.
• Lesion counting is a sensitive and reproducible method for evaluating acne treatment outcomes.