Investigating the Safety and Efficacy of the 1927-nm Thulium Laser in Keratosis Pilaris

Inclusion Criteria: * Female or male, in good health, ages 18-65 * Voluntarily signed informed consent form * Any Fitzpatrick skin type (I-VI) * Clinically diagnosed keratosis pilaris of bilateral upper arms * Willing to have photographs taken and agree to the use of photographs for regulatory, presentation, or marketing purposes * Willing and able to follow protocol procedures and requirements Exclusion Criteria: * History of receiving any laser therapy to the bilateral arms in the 12 months before recruitment * History of or concurrent use of radiation to the bilateral arms in the 12 months before recruitment * Participation of other device or drug clinical trials within 1 month before recruitment * Concurrent diagnosis of active skin condition in the arms * Presence of an active systemic or local skin disease that may affect wound healing * History of forming keloids, collagen vascular disease, chronic drug or alcohol use * History of malignant tumors in the upper arms * Presence of open ulcers or infections any skin site * Presence of a tan or sunburn over the upper arms in the month before recruitment * Use of topical or oral photosensitizing medications * Excessive body hair or tattoo in target area * Pregnant and/or breastfeeding * Presence of any medical conditions that interfere with subject's participation * History of diagnosed pigmentary disorders in the target area * Current smoker or history of smoking within 5 years