A 34-year-old female is in the Allergy/Immunology clinic today for a follow-up of Common Variable Immune Deficiency (CVID). She was last seen in the clinic 3 months ago. Since then, her condition has remained stable and the level of immunoglobulin G has been higher than 700. She is receiving IVIG 90 gm IV every month. She is pre-medicated with Tylenol and oral antihistamines and is able to tolerate the infusions well and has not had any infections of the sinuses or lung infections recently. She however reports painful area in her left armpit for the past two weeks, and it looks like she is developing hidradenitis.