Treatment, Randomized, Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Placebo Control, Parallel Assignment, Bio-equivalence Study

Inclusion Criteria:

• Patients must have 4 to 8 clinically diagnosed, non-hyperkeratotic, non-hypertrophic AK lesions within a 25 cm2 contiguous treatment area on either the face or balding scalp
• Women either must be 1 year post-menopausal, surgically sterile, or agree to use a medically accepted form or birth control
• Free of any systemic or dermatological disorder
• Any skin type or race, providing the skin pigmentation will allow discernment of erythema

Exclusion Criteria:

• Basal cell or squamous cell carcinoma, or other possible confounding skin conditions (on face and scalp)
• History of cutaneous hyperreactivity or facial irritation to topical products
• Engaging in activities involving excessive or prolonged exposure to sunlight
• Receiving systemic cancer chemotherapy, psoralen plus UVA therapy, UVB therapy, laser abrasion, dermabrasion, glycolic acids, or chemical peels 6 months prior to study entry
• Currently using or have used systemic steroids 2 months prior to study
• Currently using or have used on the treatment area over-the-counter retinol products, corticosteroids, cryosurgery, curettage, 5-fluorouracil, or other topical actinic keratosis treatments 28 days prior to randomization
• Pregnant or nursing mothers
• History of allergy or sensitivity to imiquimod or related compounds or other components of the formulation
• Taking immunosuppressant medication