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Massaging bony prominences during patient care primarily serves to increase blood supply and help prevent skin breakdown. The areas where bones are closer to the skin's surface are particularly susceptible to pressure injuries, especially in patients who are bedridden or have limited mobility. By massaging these regions, blood flow can be enhanced, ensuring that the skin and underlying tissues receive adequate oxygen and nutrients. This action can aid in maintaining skin integrity and reducing the risk of ulcer formation.

While making the patient feel more relaxed is a potential secondary benefit of massage, it is not the primary clinical purpose in this context. The idea of stimulating hair growth is not supported by evidence in relation to massaging bony prominences. Additionally, preparing an area for an injection is unrelated to the purpose of massaging, which focuses on circulation and skin health rather than injection site preparation. Therefore, the best choice reflects the importance of maintaining skin health and preventing injuries in at-risk patients.