Participants who meet all the inclusion/exclusion criteria will be randomised to one of three treatment groups: test product/positive control, test product/no treatment or positive control/no treatment at the baseline visit. Product application within treatment group will be further randomised to either the right or left side of the face. Participants will apply one of the assigned treatments to one side of the face (left or right) and another assigned treatment to the other side of the face as per the randomisation schedule. Participants will be instructed to apply the assigned treatments twice daily (morning and evening, approximately 8-12 hours apart) for 4 weeks (28 days).