Editor’s Note: This is part 1 of a 2 part series on patients with homelessness. Stay tuned for Part 2 which will deal with the intersection of homelessness and opiate drug use. A 29-year-old male named Billy presents to your emergency department with a 4-day history of progressive leg tenderness. On exam, you note a poorly demarcated area of erythema on the leg which is warm and tender to the touch, suggestive of …