Acne mallorca Acne caused by sunbathing.

Acne mechanica Acne provoked by mechanical irritation such as tight, restricting cloths or straps.

Acne medicamentosa (Drug Induced Acne) Acne brought on by medications. Common culprits include phenytoin (Dilantin), isoniazid, lithium, bromides, iodides, androgens and corticosteroids. Lithium worsens acne vulgaris and can bring on acne in persons who have never experienced acne.

Oral contraceptives containing norgestrel or norethindrone may also induce or worsen acne.

Over counter drugs containing potassium iodide, bromide (cold remedies) and chlorine (chloral hydrate) may cause acne with very small pustules.

Acne neonatorum Infant acne triggered by hormones from mother transferred to newborn. This acne usually disappears without treatment.

Acne pomade Acne occurring with persons who use pomades or thick oils daily on their hair. This oil travels from hair to forehead where it clogs pores and creates acne lesions. Avoiding touching face with oiled hands and limiting use of synthetic oils on hairs usually remedies pomade acne.

Chloracne Acne created by constant exposure to hydrocarbons in motor oil and insecticides.

Imaginary acne Imagining acne when there is actually no acne.

Pitch acne Lesions created by coal tars or dandruff tar shampoos.

Premenstrual acne Acne provoked by hormonal changes prior to menstruation.

Steroid acne Inflammation of hair follicles caused by internal steroids or from topical corticosteroids on face. Steroid induced acne appears as red papules and pustules concentrated in area where steroid was applied. Steroids thin outer layer of skin and make hair follicles more susceptible to rupture. Lesions usually leave after steroid use ends.

Tropical acne Acne experienced by some World War II soldiers in tropics who developed severe acne with horrible scarring.