This may seem obvious, but if you've been testing a moisturizer for 2 to 3 weeks and aren't seeing any positive changes in your skin's texture, it's time to swap. Look for more hydrating ingredients, like the ones listed below, to give your skin the nourishment it needs to stay healthy.

While tingling can sometimes indicate that a skin-care product is working, that isn't the case for moisturizers. If you feel any stinging or burning, "this could mean that the moisturizer isn't compatible with your skin or you have a sensitivity to one or more of the ingredients," says Dr. Orentr...

Moisturizer should help you create a smooth base for makeup, so if you notice that your foundation is pilling(forming into weird balls and quite literally roll off of your face) after you apply it, it may be because your moisturizer is too thick. When that's the case, Dr. Orentreich recommends sw...

If your skin is breaking out or feeling bumpy you apply your moisturizer, this may mean that the moisturizer is comedogenic which means its "clogging your pores causing inflammatory pimples as well as open and closed comedones..so you should switch to a non-comedogenic moisturizer." --Dr. Orentre...