You have not described the nature of the rash nor is the photo
available but nonetheless the most common causes for rash on
would be allergy and acne.
Azelaic acid (FINACEA Gel), 15%, is indicated for topical treatment of inflammatory papules and pustules of mild to moderate rosacea.
Rosacea begins as erythema (flushing and redness) on the central face and across the cheeks, nose, or forehead.