My mouth corners are very red, inflamed, and painful. My lips have been very dry and sometimes with a red outline for a week. What should I do?

It sounds like you may have a condition called angular cheilitis or perlèche. To help with this, you should stop using regular moisturizers and instead use hydrocortisone 0.5% cream on the corners of your mouth 2 to 3 times a day. For your dry lips, you can apply Vaseline™ as needed to help with the dryness. This should help alleviate the inflammation and pain in your mouth corners and dryness in your lips.