A carbuncle is a painful cluster of boils that form under the skin, typically caused by a bacterial infection, often involving Staphylococcus aureus. It usually appears as a red, swollen lump filled with pus and can occur anywhere on the body, though it is most common on the neck, back, and thighs. Treatment for a carbuncle often involves draining the pus and may require antibiotics to clear the infection. Maintaining good hygiene and avoiding skin irritation can help prevent carbuncles. If symptoms persist or worsen, it is important to consult a healthcare professional for proper care.