What is that?
A young female presents with complaints of left thumb pain and swelling preceded by a few days of upper arm and axillary pain. She states she has not had any trauma, fevers, chills, or engaged in any high risk sexual behavior recently. She was told by a friend to come to the ED so that we could “cut it open and drain it.” You see the above cutaneous finding with no other notable abnormalities of the left upper extremity. Wat is this and are you going to cut it open?