Acne is a general term used for acneiform eruption
Acneiform eruption
Acneiform eruption refers to a group of dermatoses including acne vulgaris, rosacea, folliculitis, and perioral dermatitis. Restated, acneiform eruptions are follicular eruptions characterized by papules and pustules resembling acne....

s. It is usually used as a synonym for acne vulgaris
Acne vulgaris
Acne vulgaris is a common human skin disease, characterized by areas of skin with seborrhea , comedones , papules , pustules , Nodules and possibly scarring...

, but may also refer to:
  • Acne aestivalis
    Acne aestivalis
    Acne aestivalis is a special form of polymorphous light eruption. It is a monomorphous eruption consisting of multiple, uniform, red, papular lesions, reported to occur after sun exposure....

  • Acne conglobata
    Acne conglobata
    Acne conglobata is a highly inflammatory disease presenting with comedones, nodules, abscesses, and draining sinus tracts.This condition generally begins between the ages of 18 and 30. It usually persists for a very long time, and often until the patient is around 40 years old...

  • Acne cosmetica
    Acne cosmetica
    Acne cosmetica is a term referring to acne caused by or made worse by cosmetics. The mechanism was presumably a chemically induced plugging of the pilosebaceous orifice...

  • Acne fulminans
    Acne fulminans
    Acne fulminans is a severe form of the skin disease, acne, which can occur after unsuccessful treatment for another form of acne, acne conglobata. The condition is thought to be an immunologically induced disease in which elevated level of testosterone causes a rise in sebum and Propionibacterium...

  • Acne keloidalis nuchae
    Acne keloidalis nuchae
    Acne keloidalis nuchae is a destructive scarring folliculitis that occurs almost exclusively on the occipital scalp of people of African descent, primarily men...

  • Acne mechanica
    Acne mechanica
    Acne mechanica is an acneiform eruption that has been observed after repetitive physical trauma to the skin such as rubbing, occurring from clothing or sports equipment ....

  • Acne medicamentosa
    Acne medicamentosa
    Acne medicamentosa is acne that is caused or aggravated by medication. Because acne is generally a disorder of the pilosebaceous units caused by hormones, the medications that trigger acne medicamentosa most frequently are hormone analogues...

     (drug-induced acne) (e.g., steroid acne
    Steroid acne
    Steroid acne is an adverse reaction to corticosteroids, and presents as small, firm follicular papules on the forehead, cheeks, and chest.-References:...

  • Acne miliaris necrotica
    Acne miliaris necrotica
    Acne miliaris necrotica consists of follicular vesicopustules, sometimes occurring as solitary lesions that are usually very itchy....

  • Acne necrotica
    Acne necrotica
    Acne necrotica present with a primary lesions that is a pruritic or painful erythematous follicular-based papule that develops central necrosis and crusting and heals with a varioliform scar....

  • Acne rosacea - a red rash predominantly on the face
  • Baby acne - a rash seen on the cheeks, chin, and forehead of infants
  • Blackhead
    A blackhead is a yellow or blackish bump or plug on the skin. A blackhead is a type of acne vulgaris. Contrary to the common belief that it is caused by poor hygiene, blackheads are caused by excess oils that have accumulated in the sebaceous gland's duct...

  • Chloracne
    Chloracne is an acne-like eruption of blackheads, cysts, and pustules associated with over-exposure to certain halogenated aromatic compounds, such as chlorinated dioxins and dibenzofurans...

  • Excoriated acne
    Excoriated acne
    Excoriated acne is a mild acne accompanied by extensive excoriations....

  • Halogen acne
    Halogen acne
    Halogen acne is caused by iodides and bromides that induce an acneiform eruption similar to that observed with steroids....

  • Infantile acne/Neonatal acne
    Neonatal acne
    Neonatal acne is an acneiform eruption that occurs in newborns or infants, and is often seen on the nose and adjacent portions of the cheeks.....

  • Lupus miliaris disseminatus faciei
    Lupus miliaris disseminatus faciei
    Lupus miliaris disseminatus faciei is a disease with a similar appearance to acne vulgaris....

  • Occupational acne
    Occupational acne
    Occupational acne is caused by several different groups of industrial compounds, including coal tar derivatives, insoluble cutting oils, and chlorinated hydrocarbons ....

  • Oil acne
  • Pomade acne
    Pomade acne
    Pomade acne occurs when some of the pomade that is applied to the scalp is also applied to the forehead and is responsible for the development of multiple, closely packed comedones close to the hairline....

  • Tar acne
  • Tropical acne
    Tropical acne
    Tropical acne is unusually severe acne occurring in the tropics during seasons when the weather is hot and humid....

  • Tycoon's cap
    Tycoon's cap
    Tycoon’s cap is a human disease of the scalp, classified as a mixed alopecia, characterized by minute, itchy pustules within the scalp.-Further reading:...

     - acne necrotica miliaris, a disease of the scalp
  • Pseudofolliculitis barbae
    Pseudofolliculitis barbae
    Pseudofolliculitis barbae , also known as barber's itch, folliculitis barbae traumatica, razor bumps, scarring pseudofolliculitis of the beard, and shave bumps, is a medical term for persistent irritation caused by shaving....

     (Acne keloidalis nuchae), a rash caused by shaving
  • Hidradenitis suppurativa
    Hidradenitis suppurativa
    Hidradenitis suppurativa is a skin disease that most commonly affects areas bearing apocrine sweat glands or sebaceous glands, such as the underarms, breasts, inner thighs, groin and buttocks.-Overview:...

    - chronic abscesses or boils of sweat glands and hair follicles; in the underarms, groin and buttocks, and under the breasts in women
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