The patient presents with the complaint of a swollen node under his arm. The area is tender and the node has progressed in size over the past few days. Which of the following should be included in your differential diagnosis?

Question

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Hidradenitis suppurativa and furuncles (boils) are both conditions that can cause swollen, tender nodes or lumps under the skin, particularly in areas such as under the arm. Hidradenitis suppurativa is a chronic skin condition characterized by the occurrence of inflamed and swollen lumps, typically in areas where skin rubs together. Furuncles are acute, deep infections of a hair follicle leading to abscess formation, which can also present with swollen, tender nodes.

The Patient Presents with the Complaint of a Swollen Node