Acne conglobata is an extremely severe and chronic form of acne vulgaris. In acne conglobata, multiple comedones are surrounded by inflammatory acne nodules. These keep growing bigger until they finally burst and ooze pus. . Keloid-type scars form with crusts over the nodules that become deep ulcers. This deep and irregular scarring develops into deep-seated burrowing abscesses. Invariably, scars cannot be completely cured although the disease usually dies after the patient turns 30.