Cellulitis and Erysipelas

The clinical image of a child's lower trunk and limbs shown above demonstrates a rapidly spreading, bright red, painful, and indurated skin lesion with a sharply demarcated, raised border. Which of the following is the most likely diagnosis?

The anatomical illustration above demonstrates a pathological process primarily involving the hypodermis and deep fat layers. Which of the following skin infections is characterized by inflammation and infection predominantly at this anatomical depth?

A 38-year-old woman presents with a 2-day history of pain and swelling over her right cheek. On examination, there is a bright red, warm, shiny patch with a sharply demarcated, raised border. The lesion is non-pitting and confined to the face. She reports high fever (39.2°C) and chills. Blood culture and skin swab are sent. What is the most appropriate initial antibiotic therapy?

A 52-year-old man from rural Maharashtra presents with a 3-day history of fever (38.5°C), severe pain, and swelling of the left leg below the knee. On examination, there is poorly demarcated erythema with induration, warmth, and tenderness. The skin surface is intact. There are no vesicles, bullae, or lymphangitis. He has a history of type 2 diabetes mellitus (HbA1c 8.2%) and a small laceration on the sole of the foot sustained 5 days ago while walking barefoot. Blood culture and wound culture are pending. Which is the most likely causative organism?

A 38-year-old woman presents to the clinic with a 2-day history of fever (39°C) and a sharply demarcated, raised, bright red patch on her left cheek. The lesion has a "slapped cheek" appearance with a well-defined border. There is associated cervical lymphadenopathy and mild systemic toxicity. The skin is intact with no vesicles or pustules. She denies any recent trauma or insect bite. On examination, the erythema does not blanch completely with pressure. Which of the following is the most appropriate initial management?