This figure presents a side-by-side comparison of axial non-enhanced CT images of the abdominal wall, illustrating complications from different subcutaneous injection types. The left panel (labeled 'HEPARIN') demonstrates multiple subcutaneous collections characterized by parenchymatous density, consistent with localized hematomas or bleeding resulting from repeated heparin injections. Within these soft-tissue nodules, small punctate air bubbles are visible. The right panel (labeled 'INSULIN') illustrates insulin-induced lipohypertrophy. These lesions appear as focal, heterogeneous subcutaneous masses that prominently feature dense peripheral calcifications (white arrows). The comparison highlights the different imaging signatures of injection-related sequelae: hemorrhagic collections and air pockets associated with anticoagulants versus calcified fatty proliferation (lipodystrophy) associated with chronic insulin therapy. Both images provide a cross-sectional view of the anterior abdominal wall at the level of the pelvis and mid-abdomen, emphasizing the clinical importance of recognizing benign injection-related findings that may mimic more serious abdominal wall pathology.

Clinical photograph of a 37-year-old female patient's torso, illustrating preoperative findings before a right mastectomy and DIEP (Deep Inferior Epigastric Perforator) flap reconstruction. The image focuses on the abdomen and chest. Extensive ecchymosis (bruising) is visible across the bilateral lower abdomen, characterized by irregular patches of purple and blue discoloration. These lesions are consistent with subcutaneous heparin or enoxaparin injection sites, commonly used for perioperative thromboprophylaxis. The upper torso shows the right breast area prepared for surgical intervention, with visible skin changes and subtle scarring in the infraclavicular region. A medical dressing is present on the right antecubital fossa, likely covering an intravenous access site. This photograph serves as an educational example of the local dermatological effects of anticoagulation therapy in patients undergoing complex reconstructive surgery.

This image depicts a clinical photography of a subcutaneous injection being administered with a disposable pen-type injector. The device features a dose dial and a plunger, with a yellow indicator visible near the advance mechanism. A clinician or patient stabilizes the skin with the non-dominant hand by pinching subcutaneous tissue, while the dominant hand positions and depresses the plunger to deliver medication into the adipose layer. The needle enters the skin at a near perpendicular angle (approximately 90 degrees) to deposit the drug into subcutaneous fat for slower absorption. The abdomen is a common site for injections, but other practical regions include the outer thigh or upper arm; site rotation is advised to minimize lipohypertrophy and ensure consistent pharmacokinetics. After needle insertion and dose delivery, the device is withdrawn and the skin is gently blotted to reduce bleeding. The procedure emphasizes correct technique, avoiding intramuscular injection, excessive tissue compression, or needle bending. This image is a useful educational resource for medical trainees, diabetic patients, and healthcare professionals to practice safe subcutaneous administration, review needle depth and angle, and reinforce dose accuracy and device function. The DermNet watermark indicates dermatology education and skin-focused clinical documentation.