Rashes can definitely be caused by a variety of factors, but they’re also a big indicator of allergic reactions in response to using certain cosmetic products. Makeup and skin care formulas can contain allergenic inactive ingredients, which usually contribute to the product’s overall look and smell. However, it’s usually these same ingredients that can lead to those irritating rashes you’ve noticed on your skin. “Rashes can be caused by preservatives, fragrances or acrylates