To prevent formation of hard nodules-rationale: rotating injection sites promotes adequate drug absorption and prevents formation of hard nodules caused by repeated injections into the same site. nodules may impede drug absorption with future injections. rotating sites doesnt prevent bruising, medication leakage, or erratic drug distribution.client needs category: safe, effective care environmentclient needs subcategory: safety and infection controlcognitive level: knowledgereference: abrams, a.c., et al. clinical drug therapy: rationales for nursing practice, 8th ed. lippincott williams & wilkins, 2007, p. 429.