MICROBIOLOGICAL IMPACT OF THE USE OF MAKEUP TESTERS: RISKS AND PREVENTION

Abstract

The use of makeup testers is a widespread practice in cosmetic retail stores; however, these products often lack adequate microbiological control. Shared cosmetics may act as fomites, accumulating microorganisms capable of causing cutaneous, ocular, and mucosal infections. Recent studies demonstrate significant microbial contamination in shared cosmetic items, including Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa—all widely recognized as opportunistic pathogens (Bloomfield et al., 2017; Mukherjee et al., 2020). This study aimed to microbiologically evaluate mascara, compact powder, and lipstick testers using broth enrichment, inoculation on selective and non-selective media, Gram staining, and preliminary biochemical tests. The results showed the presence of Gram-positive cocci and Gram-negative bacilli, reinforcing the hypothesis of cross-contamination and potential health risk associated with shared cosmetic products. It is concluded that biosafety measures, consumer education, and stricter sanitary policies should be implemented to mitigate the transmission of microorganisms in commercial environments.