If a customer experiences skin irritation but cannot identify any visible pests, what pest might you suspect?

When a customer experiences skin irritation without being able to identify any visible pests, mites are a plausible suspect. Mites can cause skin irritation due to their bites, but they are often too small to be seen by the naked eye. For example, species like scabies mites burrow into the skin and cause severe itching and irritation. Additionally, dust mites can trigger allergic reactions and skin sensitivities in some individuals, leading to symptoms that may be mistaken for pest bites.

In contrast, while fleas and bed bugs are known for leaving visible bites and sometimes even droppings, they are generally larger and more easily detectable than mites. Ticks, on the other hand, typically remain attached to the host and can be seen, making them less likely in a scenario where no visible pests are found. Therefore, considering the nature of the symptoms and the unlikelihood of sighting the pest, mites are the most logical suspect in this scenario.