Composition: Tretinoin 0.05% w/w Retiderm 0.05 gel is a form of vitamin A that is used to treat acne which appears as spots or pimples on your face, chest or back. It also helps to smooth rough facial skin and to reduce fine wrinkles on the skin. This gel usually works by reducing the excessive production of oil from the skin. It is used once a day at bedtime or as directed by a doctor. Some of the common side-effects like irritation, dryness, and redness of the skin may occur. Don't forget to apply moisturizer during applying this gel as it causes dryness in the skin. This medicine may make you more sensitive to sunlight so you should limit exposure to the sun if possible.