Final answer:
Plantar Warts, caused by Human papillomavirus (HPV), are a common viral infection in salons, presenting as small black dots usually in clustered groups on the soles of the feet.
Step-by-step explanation:
The common viral infection seen in salons that resembles small black dots, usually in clustered groups, is Plantar Warts. These are caused by the Human papillomavirus (HPV) and typically appear on the soles of the feet. Plantar warts can be contracted in warm, moist environments, such as salon floors or by using contaminated tools. Standard hygiene practices like disinfecting salon tools and floors can reduce the risk of transmission. In contrast, viral infections such as Chicken Pox, Hepatitis, and Measles do not present as small black dots on the skin.