What must not be present in salon personnel while on the premises?

In a salon environment, the presence of infectious diseases among personnel is critical to address because it poses a serious risk not only to the individuals who work in the salon but also to clients seeking services. Infectious diseases can easily spread in close-contact settings like salons, where multiple clients are served throughout the day. This can lead to outbreaks of illnesses, which not only compromise individual health but can also result in legal issues and damage to the salon's reputation.

While allergies and skin irritations may also be concerns, they do not typically carry the same level of risk for contagion and can often be managed or accommodated in a workplace setting. Similarly, cosmetic applications are a core part of salon services and therefore should always be present. Therefore, maintaining a safe environment free from infectious diseases is essential to protect the health and safety of both clients and employees.