Cosmetics have been around for centuries and are used by a large majority of women, and some men, to enhance appearance or to cover a blemish, etc. It is definitely possible to develop an allergic reaction to any cosmetic product. It is recommended when trying a new product or product line, use only one at a time in the event of a reaction. Allergic dermatitis can result in redness, itchiness, swelling, and often fluid-filled blisters on the areas of the skin that came in contact with the substance. Usually simply stopping use of the product will prevent further complications. If the irritation lasts more than 10 days or is severe, see your doctor.