Don't slather on eye cream. A pea-sized amount for each eye is more than enough.
If you use too much: Using too much eye cream can leave your skin sensitive, clog your pores, and irritate your eyes. Putting too much on your skin can also make it challenging to apply your makeup.
If you use too little: Skimping on eye cream can leave that delicate skin dehydrated and keep makeup from lying on the skin properly, Taub says.
If you're using a moisturizer that suits your skin type, a nickel-sized amount should be enough for your whole face.
If you use too much: Overdoing moisturizer can make your skin shiny and lead to breakouts. It can also feel heavy on your skin and make it harder to put on your makeup.
If you use too little: Your skin may feel tight, flake, and look dull because it's not as hydrated as it could be.
Use a grape-sized amount for your face. For the rest of your body, you need enough sunscreen to fit in a shot glass.
If you use too much: "Most people don't use enough sunscreen," Schweiger says. "In this case, there is no such thing as using too much."
If you use too little: You could get sunburn. Over time, you might also get sun-damaged skin that looks old before its time. You could also get skin cancer.
A dab is enough to exfoliate. Taub recommends using a scrub with round beads, not jagged edges that could make small tears in your skin.
If you use too much: Your skin may become dry, irritated, red, and sore. Other products will sting when you put them on your face.
If you use too little: There's no downside."Scrubs are not mandatory, and they do not make or break a skin care routine," Barba says.