What is a furuncle with interconnecting subcutaneous pockets?

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A carbuncle is a cluster of furuncles (or boils) that are interconnected by subcutaneous pockets. It is a deeper and more severe form of skin infection than a single furuncle, and can be accompanied by fever, chills, and malaise. Impetigo is a highly contagious bacterial skin infection that causes red sores on the face, while cellulitis is a bacterial infection of the deeper layers of skin and subcutaneous tissue.

What Is a Furuncle with Interconnecting Subcutaneous Pockets