Furuncle (or boil) is a skin disease caused by the infection of hair follicles, resulting in the localized accumulation of pus and dead tissue. Individual boils can cluster together and form an interconnected network of boils called carbuncles.

Boils are red, pus-filled lumps that are tender, warm, and extremely 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. An abscess is also a contained collection of pus; however, it can occur anywhere in or on the body. A boil always involves a hair follicle.
In a severe infection, multiple boils may develop and the patient may experience fever and swollen lymph nodes. A recurring boil is called chronic furunculosis. Risk factors for furunculosis include bacterial carriage in the nostrils, diabetes mellitus, obesity, lymphoproliferative neoplasms, malnutrition, and use of immunosuppressive drugs.

In some people, itching may develop before the lumps begin to form. Boils are most often found on the back, stomach, underarms, shoulders, face, lip, eyes, nose, thighs and buttocks, but may also be found elsewhere.
The treatment is the incision and dreinage of pus followed by topical or systemic antibiotic therapy. The dermatological examination is very important in assesing of causes and predisposant factors. For every patient will be explained the prevention measures and further biological investigations might be indicated.

Sebaceous cyst

The sebaceous cyst is resulted through obstruction of sebaceous gland. They appear at young or adult persons who have predisposition to develop a seboreic syndrome and they are usually localised on chest, scalp, face, arms and legs. In males a common place for them to develop is the scrotum and chest.
The incidence of this disease is not predictable but sometimes can be influenced by heredity. This is the case of Gardner Syndrome and Basal Cell Nevus Syndrome.

Clinical presentation may vary from small cutaneous tumors with normal epidermis to big tender tumors with erithematous aspect due to suprainfection.
Sometimes, the content may evacuate spontaneously or after trauma, and reveal an white yellow, creamy material with unpleasant odour.
In time, the cysts may stay unchanged for long period of time, may empty periodically or might be infected.

With surgery, a cyst can usually be excised in its entirety. Poor surgical technique or previous infection leading to scarring and tethering of the cyst to the surrounding tissue may lead to rupture during excision and removal. A completely removed cyst will not recur, though if the patient has a predisposition to cyst formation, further cysts may develop in the same general area.
The intervention is on local anethesia for complete comfort of the patient.