Final answer:
Laura should use a lightweight, non-comedogenic massage medium such as astringent oils like hazelnut or grapeseed for a client with oily skin.
Step-by-step explanation:
When dealing with a client with oily skin, a massage therapist like Laura should opt for a lightweight, non-comedogenic massage medium. For example, astringent oils like hazelnut or grapeseed oil can be beneficial as they are lighter and easily absorbed by the skin. It's essential to avoid heavy, occlusive oils that can exacerbate oily skin conditions and potentially clog pores. Instead, massage mediums that balance sebum production and promote skin health without adding excessive oil are desirable.