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ingrown hair A boil , also called a furuncle , is a deep folliculitis , which is an 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. [ 1 ]
Ingrown hair is a condition where a hair curls back or grows sideways into the skin.The condition is most prevalent among people who have coarse or curly hair. It may or may not be accompanied by an infection of the hair follicle (folliculitis) or "razor bumps" (pseudofolliculitis barbae), which vary in size.
Pseudofolliculitis nuchae, a related condition, occurs on the back of the neck, often along the posterior hairline, when curved hairs are cut short and allowed to grow back into the skin. Left untreated, this can develop into acne keloidalis nuchae, a condition in which hard, dark keloid-like bumps form on the neck. Both occur frequently in ...
Several hairs arise from the same hair follicle. Scarring and permanent hair loss may follow. The cause is unknown. Folliculitis keloidalis scarring on the nape of the neck is most common among males with curly hair. Oil folliculitis is inflammation of hair follicles due to exposure to various oils, and typically occurs on forearms or thighs.
[1] [2] Shaving the area and laser hair removal may prevent recurrence. [1] [4] More extensive surgery may be required if the disease recurs. [1] Antibiotics are usually not needed. [2] Without treatment the condition may remain long term. [1] About 3 per 10,000 people per year are affected, and it occurs more often in males than females. [2]
A sebaceous cyst is a term commonly used to refer to either: [1] Epidermoid cysts (also termed epidermal cysts, infundibular cyst) Pilar cysts (also termed trichelemmal cysts, isthmus-catagen cysts) Both of the above types of cysts contain keratin, not sebum, and neither originates from sebaceous glands.
The characteristic components of a pilomatricoma include a stroma of fibrovascular connective tissue surrounding irregularly shaped, lobulated islands containing basaloid cells (being darkly stained, round or elongated, with indistinct cell borders and minimal cytoplasm, with nuclei being round to ovoid, deeply basophilic and generally ...
Relative incidence of cutaneous cysts: Trichilemmal cyst is labeled near top. A trichilemmal cyst (or pilar cyst) is a common cyst that forms from a hair follicle, most often on the scalp, and is smooth, mobile, and filled with keratin, a protein component found in hair, nails, skin, and horns.