To drain or not to drain?

A 67-year-old man presents with shortness of breath and fever. He has recently completed his first 2 week chemotherapy course for auricular Squamous Cell Carcinoma, administered via a PICC line.
A 28-year-old male presents with an acutely red eye and reduced visual acuity.
A 17-year-old woman presents to ED with intense pain a week after having a henna tattoo.
A 3-year-old boy presents to the Children's Emergency Department with a painful rash.
An 89-year-old female presents with an unrecordable temperature.
A man in his 20s attends the ED after injuring his foot while playing football.
A 23-year-old male was playing rugby 4 days ago. He was touching down in his in-goal area for a 5-metre scrum when he was kneed in the back towards his left side.
A 45-year-old male with a history of hypertension, type 2 diabetes mellitus, and Von Hippel-Lindau syndrome presents to the ED with paroxysmal headaches and elevated blood pressure.
This 18-year-old patient was allegedly punched by a stranger during a night out.
A 25-year-old male patient presents to the emergency department with a history of nosebleeds when he presses his forehead.
A 76-year-old presents with abdominal pain. He is clinically shocked (hypotensive and tachycardic) with a known abdominal aortic aneurysm.
A 4-year-old child attends the ED with some spots on her arm which look inflamed and have become more numerous over the last week.