Furuncle (boil) is a deep infection of the hair follicle. It is most commonly caused by infection by the bacterium Staphylococcus aureus, resulting in a painful swollen area on the skin caused by an accumulation of pus and dead tissue.

Boils are bumpy, red, pus-filled lumps around a hair follicle that are tender, warm, and painful. A yellow or white point at the center of the lump can be seen when the boil is ready to drain or discharge pus. In a severe infection, an individual may experience fever, swollen lymph nodes, and fatigue.

Boils may appear on the buttocks or near the anus, the back, the neck, the stomach, the chest, the arms or legs, or even in the ear canal. Boils may also appear around the eye, where they are called styes.

Squeezing or cutting should not be attempted at home, as this may further spread the infection. Antibiotic therapy may be recommended for large or recurrent boils or those that occur in sensitive areas (such as the groin, breasts, armpits, around or in the nostrils, or in the ear).

Treatment ― OTC Drugs
#Benzoyl peroxide [OXY-10]

  • Small lesions can be resolved with topical antibiotic treatment.
  • Antibiotic treatment is needed as it can progress to cellulitis.
  • The severe form of folliculitis is called a Furuncle.
  • Antibiotic treatment is necessary as it can progress to cellulitis.
References Carbuncle 32119346 
A carbuncle is a contiguous collection of two or more furuncles. A carbuncle is an infection of the hair follicle(s) that extends into the surrounding skin and deep underlying subcutaneous tissue. They typically present as an erythematous, tender, inflamed, fluctuant nodule with multiple draining sinus tracts or pustules on the surface. Systemic symptoms are usually present, and regional lymphadenopathy may occur. They can arise in any hair-bearing location on the body; however, they are most common in areas with thicker skin such as the posterior neck, back, and thighs. A carbuncle can start as a folliculitis, which, if left untreated, can lead to a furuncle, and when multiple furuncles are contiguous, it becomes classified as a carbuncle. Carbuncles can be solitary or multiple.