The objective will be to assess clinical bioequivalence of 0.1% Retin-A Micro® Gel and Spear Pharmaceutical's generic 0.1% Tretinoin Microsphere Gel with a placebo arm.

Not required

Inclusion Criteria:

• Normal, healthy male and female children and adult
• Written and verbal informed consent must be obtained. Patients age 12 to 17 (inclusive) must sign an assent for the study and a parent or a legal guardian must sign the informed consent.
• Women of child-bearing potential must be non-pregnant and non-nursing, and must be willing to avoid pregnancy during the course of the study and during the menstrual cycle following completion of their participation in the study.
• Able to refrain from the use of all other topical acne medications or antibiotics during the treatment period.
• Considered reliable and capable of understanding their responsibility and role in the study.

Exclusion Criteria:

• Significant history or clinical evidence of auto-immune, cardiovascular, gastrointestinal, hematological, hepatic, neurological, pancreatic, or renal disease.
• Abnormal pre-existing skin condition which might affect the normal course of acne vulgaris (e.g., eczema, psoriasis, albinism, or chronic vesiculobullous disorders).
• Use topical acne therapy during the two week period prior to study initiation.
• Use of systemic retinoid treatment within six months prior to study initiation.
• Pregnant or breast-feeding.
• Serious psychological illness.
• Participation in any clinical research study during the 30 day period preceding study initiation.

No unexpected problems.