When I finish applying the cream on my face after opening it, it appears that the cream starts to harden. It's not like the first day after the cream is done. Please consult me on how to fix it or is it because of which active ingredient is causing this problem? How long, how many days, or just 1-2 days after the production is finished? How do you keep it? And in what kind of container? Approximately what is the storage temperature?Staff - MySkinRecipes