This one probably sounds obvious, but in case you aren't doing this already, you should be seeing a dermatologist at least once a year. As you mature, your body can react differently to products and ingredients that you've been using your whole life, and seeing a specialist can help you decipher what those irritants are. It's great to have someone to check in with every time you have an issue, but generally, one checkup a year is good to make sure you're keeping up with your skin's health.