Do you recommend any of these: porcelana day/night cream, even tone fade cream, or esoterica fade cream? Do they work for dark underarms too?

Yes. These all contain hydroquinone which is a bleaching agent but they are available over-the-counter so contain less percentage of the active ingredient than is available in prescription products or those that are dispensed from doctors' offices. They do help somewhat with dark patches but don't expect them to clear completely. If not helping enough, see doctor for higher strength or procedures.