When you use cheap Retin-A you will want to have a basic background related to when you can and should use it, as well as when you should not use it. As previously mentioned, you can use this generic retin-a to help with acne. However, you will not want to use this medication if you are suffering from any current skin issues such as a sunburn or you have dry or chapped skin. This treatment may actually make these things worse. Therefore, if you can avoid using retin-a until these issues clear up you will be much better off.