The purpose of this study is to find out if taking a birth control pill, YAZ, is safe and effective for treating acne on the trunk (the main part of the body that does not include the arms, legs, and head).

Acne vulgaris is a very common skin disorder. It is caused when oil-producing skin glands (sebaceous glands) become plugged. The plug can cause blackheads, whiteheads, pimples, and cysts on the face, neck, upper chest, and upper back.

YAZ is a combination birth control pill. A "combination" pill means that it is made up of more than one major ingredient. Nearly all birth control pills are made up of a combination of estrogen and progestin hormones. Estrogens are steroid hormones produced by the ovaries responsible for the typical female features. Progestins are steroid hormones produced by the ovary and placenta responsible for making the uterus fit for pregnancy. YAZ also contains an estrogen called ethinyl estradiol, and a progestin called drospirenone. People who develop acne have sebaceous glands that are over-stimulated (that is, the sebaceous glands have increased activity) by male sex hormones (androgens). The progestin in YAZ blocks the male sex hormones (androgens) that cause acne.

The study drug being used in this study is called YAZ. It has been approved by the U.S. Food and Drug Administration (FDA) to treat moderate acne in women who want an oral contraceptive for birth control.

In this study, YAZ will be compared to a placebo for safety and effectiveness. A placebo looks like the study drug but contains no active drug (like a sugar pill). We use placebos in research studies to learn if the effects seen in research subjects are truly from the study drug or from other reasons.

Acne is a common skin disease that affects 85-100% of the population. Although it often appears during puberty, it may persist during the third decade of life and even later. It is characterized by a variety of lesions consisting of non-inflammatory lesions known as comedones, and inflammatory lesions such as papules, pustules, nodules and cysts. It commonly occurs on the face, chest, and back. Although not as noticeable as facial acne, truncal acne may also affect a person's self esteem and body image and reduce one's participation in sports because of the need to undress in a shared locker room. Most acne studies focus on facial acne and ignore treatment outcomes in the chest and back.

The pathogenesis of acne is multifactorial, developing in the sebaceous gland. These factors include intrafollicular hypercornification, which induces follicular obstruction resulting in comedone formation, excess sebum production, Propionibacterium acnes activity and inflammation.

Hormone therapies, such as oral contraceptives and antiandrogens (e.g. spironolactone) counteract the effects of androgens on the sebaceous glands. It has been over ten years since estrogen-containing oral contraceptives (OCs) first obtained FDA approval for use in acne. Since then, several randomized controlled trials have corroborated their efficacy and safety for this growing indication in women of child bearing age. Studies have shown hormonal therapies to be effective in treating moderate acne vulgaris in women with no known contraindication to OC therapy.

YAZ is an oral contraceptive that is FDA approved for acne vulgaris. Unlike other progestins, drospirenone has unique antimineralocorticoid (mild diuretic effect) and antiandrogenic properties. The antiandrogenic property of drospirenone means that it blocks the male sex hormones that can cause acne. In two multicenter, double blind, randomized, placebo-controlled studies, 889 subjects, ages 14 to 45 years, with moderate acne received YAZ or placebo for six 28 day cycles. The primary efficacy endpoints were the percent change in inflammatory lesions, non-inflammatory lesions, total lesions, and the percentage of subjects with a "clear" or "almost clear" rating on the Investigator's Static Global Assessment (ISGA) scale on day 15 of cycle 6.

Subjects will be assigned to a treatment group upon randomization. Bayer HealthCare Pharmaceuticals personnel, investigators, subjects and study nurse/coordinators will be blinded to the study product treatment assignment. The study duration will be 24 weeks with visits at screening, baseline (week 0), week 6, week 12, week 18, and week 24. Lesion counts (total, inflammatory, non-inflammatory) and an ISGA, and photography will be performed on every visit. A physical examination will be done at baseline and Week 24. Safety will be assessed from reported adverse events (AEs).

Inclusion Criteria:

• Female Subjects 18-45 years of age who have achieved spontaneous menarche.
• A clinical diagnosis of truncal acne vulgaris and the desire for an oral contraceptive for birth control.
• A minimum of 10 but not more than 50 inflammatory lesions on the back and chest combined.
• Maximum of 5 nodules.
• Willing and able to understand and sign informed consent.
• Able to complete study and comply with study procedures.

Exclusion Criteria:

• Use of topical acne medications such as tretinoin, benzoyl peroxide or topical antibiotics within 2 weeks
• Use of oral antibiotics within 30 days.
• Use of systemic corticosteroids within 4 weeks.
• Use of oral contraceptives within 12 weeks.
• Use of isotretinoin in past six months.
• Use of phototherapy devices for acne such as ClearLight or Zenozapper within 1 week.
• Use of tanning booths or lamps within 1 week prior to baseline.
• BMI >30
• History of renal insufficiency
• History of hepatic dysfunction
• History of adrenal Insufficiency
• History of vascular or metabolic disease including existing or previous arterial thromboembolic diseases (myocardial infarction, stroke), existing or previous venous thromboembolic diseases (deep vein thrombosis, pulmonary embolism), and any condition which could increase the risk to suffer any of the above mentioned disorders
• History of hypertension
• Diabetes mellitus with vascular involvement
• Migraine headaches with focal neurological symptoms
• Recent major surgery with prolonged immobilization
• Known or suspected carcinoma of the breast
• Carcinoma of the endometrium or other known or suspected estrogen-dependent neoplasia
• Undiagnosed abnormal genital bleeding
• Cholestatic jaundice of pregnancy or jaundice with prior pill use
• Liver tumor (benign or malignant) or active liver disease
• Smoking > ½ pack of cigarettes/week
• Regular intake of medications that may increase potassium levels such as NSAIDS, potassium sparing diuretics, potassium supplementation, ACE inhibitors, Angiotensin-II receptor antagonists, heparin and aldosterone antagonists.
• Hypersensitivity to any component of the study drug
• Clinically significant abnormal findings or conditions (other than acne), which might, in the opinion of the Principal Investigator, interfere with study evaluations or pose a risk to subject safety during the study.
• Subjects who are known to be pregnant or planning a pregnancy.

Early termination leading to small number of subjects analyzed