Clinical Trial to Evaluate Safety, Tolerability, and Pharmacokinetics of SOF-SKN in Healthy Participants

Inclusion Criteria: * Healthy Volunteers 18 to 64 years. * Participants with Fitzpatrick skin type I to IV. * Participants must have a back surface area of at least 24 × 30 cm to accommodate two - 10 × 30 cm application areas with a 4 cm separation between them. * No Allergies. * Contraception. * Must be willing to abstain from the use of moisturizers and other topical applications on the back 24 hours prior and for the duration of the study. Exclusion Criteria: * Allergic constitution. * Within 72 hours of the start of study treatment, the use of antihistamines or use of topical drugs at the application site. * Hair removing interventions including laser treatment, shaving and waxing in the target area within 1 week before Screening. * Hypertrichosis on the back; no tattoos that cover greater than 30% of the back surface area. * Presence of an inflammatory dermatosis (including, but not limited to, atopic dermatitis, eczema, psoriasis, extensive acne), and/or suntan/burn that could interfere with the test field evaluation. * Non-inflammatory skin lesions and changes (including, but not limited to, hyperpigmentation, multiple naevi, tattoos, blemishes, birthmarks, abrasions, ulcers, eschar, and/or scabs) present in the target area on the back that could interfere with the test field evaluation. * Any history of or presence of in situ melanoma and non-melanoma skin cancer within the last 3 years. * Any other skin disease or other visible skin condition noted on physical examination which in the Investigator's opinion might interfere with the evaluation of the test field reaction.