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A carbuncle is a cluster of caused by infection, most commonly with Staphylococcus aureus or Streptococcus pyogenes. The presence of a carbuncle is a sign that the immune system is active and fighting the infection. The infection is contagious and may spread to other areas of the body, or other people; those living in the same residence may develop carbuncles at the same time. In the early 21st century, infection involving methicillin-resistant Staphylococcus aureus (MRSA) has become more common.
A carbuncle is Palpation and can range in size from as small as a pea to as large as a golf ball. The surrounding area is Induration. Later, skin on the centre of the carbuncle softens and peripheral satellite vesicles appear; these rupture, discharging pus, and give rise to appearance. As the impending infection develops, itching may occur. There may be localized erythema or skin irritation, and the area may be painful when touched. Sometimes more severe symptoms may occur, such as fatigue, fever, chills, and general malaise as the body fights the infection.
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