Which of the following treatments would likely involve an exfoliating process?

Dermabrasion is a treatment that specifically involves an exfoliating process. It is a technique that physically removes the outer layers of skin, primarily through a specialized device that sands or abrades the skin's surface. This procedure effectively helps to eliminate dead skin cells, stimulate collagen production, and improve issues such as scarring, uneven texture, and signs of aging.

In contrast, hydrotherapy typically focuses on the therapeutic use of water for relaxation and physical benefits rather than skin exfoliation. Light therapy is mainly used for its effects on skin conditions such as acne or pigmentation but does not involve a physical exfoliation process. Similarly, ultrasound treatment uses sound waves for deeper penetration into the skin for effects such as tightening and lifting, rather than removing the outer layer of dead skin cells. Thus, dermabrasion stands out as the procedure that specifically incorporates exfoliation as a core component of its treatment method.