A study to compare the skin irritation potential of two marketed gels for acne treatment,
each applied to half of the face of healthy volunteers.
At the Baseline Visit, following satisfaction of entry criteria and screening procedures,
all subjects will be applying two products on their faces, each on half face. The side of
face receiving each product is randomly assigned. One group will use tretinoin facial gel on
the left side and adapalene facial gel on the right side of the face daily for two
consecutive weeks after washing with study-supplied facial wash. The other group will use
the same products, but on opposite sides of the face for two consecutive weeks after washing
with the same study-supplied facial wash.
Subjects will return to the study center every weekday morning for evaluation and for the
morning application of both study products. Study personnel will monitor application on the
weekdays. There will be a daily clinical evaluation of skin irritation by a blinded
dermatologist and by subjects. At baseline and at the end of each week subjects will be
photographed and have chromometer readings.
- Healthy volunteers
- Before screening, subjects (or legally authorized representative) must read and sign
the IRB approved Informed Consent Form (includes HIPPA and Photo release).
- Subject must have Fitzpatrick Skin Type I, II or III, and judged by the Investigator
to have healthy skin.
- Subject's bilateral facial skin must be clear of any confounding irritation, rashes,
acne, rosacea, etc. prior to study start.
- Subject must be free of systemic retinoids for at least 2 months.
- Subject must not be using any topical retinoids, systemic antibiotics, nicotinamide
or systemic steroids for 1 month prior to study start.
- All other topical medications to face (e.g., steroids, antimicrobials, salicylic
acid, and benzoyl peroxide) and cosmetics containing retinols, AHA's and bleaching
agents such as hydroquinone are to be discontinued at least 2 weeks prior to study
- Subjects will not apply any emollients and cosmetics to the facial area 24 hours
prior to study initiation.
- Subject must not be planning to become pregnant or nursing before entering the study
and during the study period. In addition if using birth control pills, subject must
be stabilized for at least 2 months. If subject is of child bearing potential,
subject must be using approved method of birth control. Approved methods are birth
control pills, implants, patches or spermicide with condoms.
- Subjects who are pregnant or nursing.
- Subjects who have a grade 1 or more for facial erythema.
- Subjects who exhibit any skin condition (i.e., atopic dermatitis, seborrheic
dermatitis, and psoriasis) or disease that may require concurrent therapy or may
confound the evaluation of drug safety or efficacy.
- Subjects who have a history of hypersensitivity to any of the formulation components
listed in Appendix 1.
- Subjects who have received any experimental drug or used any experimental device 30
days prior to initiation of study therapy.
- Subjects who have excessive facial hair that may obstruct or hinder the evaluation of
- Subjects who use any known photosensitizing agents.
- Subjects who presently have skin cancer or actinic keratosis on the face.