What is a carbuncle? A carbuncle is a connected group of boils that stem from an infection of the skin. “They are sometimes confused for a spider bite,” said Dr. Allison Arthur, a dermatologist and ...

What is a carbuncle, you might ask? Turns out, it is an old term for a red gemstone. Hmmmm. How does one explain the color of the one in "Sherlock Holmes' Adventure of the Blue Carbuncle," being ...