Retin-A (tretinoin topical) is a remedy that can be used to treat acne. It works by boosting the process of skin renewal therefore making it possible for your skin to look better. This drug can make your skin more sensitive to the effects of direct sun rays, making a sunburn easier. It may take you quite some time until you notice the first result of your treatment - weeks or maybe even months. During all that time you will need to apply Retin-A as recommended to make sure you get all the benefits of your treatment. Avoid washing your face within one hours for the moment you applied a thin layer of Retin-A to let the medicine work. As make sure you avoid using any other skin products after applying Retin-A, as they may interfere with the effects of Retin-A. Retin-A is a part of a complete program of skin care that involves avoiding sunlight and using good sunscreen along with taking Retin-A. It's very important to follow all the recommendations of your doctor. Serious side effects are rare and include the following ones: hives, swelling of your face, lips, tongue, or throat, and difficulty breathing. Make sure you seek emergency help if you get any of the symptoms mentioned above, as they mean you may be getting an allergic reaction to the medicine prescribed.