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Thanks for your interesting question. The short answer is no, you do not need to use two forms of birth control while on topical tretinoin. The retinoids in general are not recommended in pregnancy, since we don't know how much would be absorbed and potentially affect a fetus, but there are not any cases I know of where a baby was harmed by topical tretinoin use by the mother. You are absolutely right about two forms of birth control being mandatory for oral isotretinoin, but topical tretinoin is not nearly as strong and is not known to cause harm if someone accidentally continues it a little while into a pregnancy. Ask your dermatologist, but you should be fine with just one form of birth control used consistently.
Retinoic Acid is like an exfoliant in that it turns your skin cells over so it is a fantastic medication for antiaging. However, it will make your skin more sensitive to acids and the sun. Wait until you are acclimated to the medication - no peeling, major redness, or "anticipated reaction"...
Thanks for your question. It is possible to use retin-a on the neck, but you will want to just use a very small amount to avoid irritation. Ask your dermatologist if they would recommend anything in addition to retin-a for that area. Sometimes people need some IPL treatments or other laser...
Thank you for your question and posting a picture. It looks and sounds like you have Post Inflammatory Hyperpigmentation (PIH). You can start by looking for prescription strength 4% Hydroquinone (HQ) to reduce the pigment. Do not buy it over the counter or off the internet. Laws vary by state....