A robust and healthy skin barrier is key to good skin health overall. Key Takeaways AccordionItemContainerButton LargeChevron Maintaining a healthy skin barrier can help you with good skin health overall in the long run. The skin barrier is “the very top layer of your skin – the stratum corneum – and the slightly acidic ‘mantle’ and the community of microbes that live there,” Dr Eirini Merika, consultant dermatologist at Eucerin explains.