Use non-comedogenic products. Non-comedogenic beauty products don't clog pores, which can lead to irritation and blemishes. Keep this in mind with sunscreen, but it may matter more if you're frequently moisturized and acne-prone - especially in the summer. Hot and humid weather leads to sweating, which takes longer to evaporate from the skin. Combining this with oily products is no fun for your pores. Go the oil-free or non-comedogenic route to evaporate pimples.
Stay hydrated with good pure/organic products. A faithful moisturizing routine can do so many beneficial things for your complexion. Your skin is the barrier that protects you from environmental factors like pollution, bacteria, and moisture loss, and keeping it moisturized helps keep that barrier in place. Dry skin is miserable and prone to damage, so use a light moisturizer to protect it from summer drying factors like sunburn, salt and chlorine.
Exfoliate at the right time - and don't overdo it! Not only will it help you maintain a fresh fake tan (once the dead skin cells flake off, the old tan will come off with it), but a gentle facial scrub will help keep your skin free of clogged pores and create a better canvas for makeup application. Keep in mind, however, that exfoliating exposes new, sensitive skin that may be more susceptible to sunburn. Save your exfoliating habits for the evening (and not right before a special occasion), or for days when you're not going straight from the shower to the pool.
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Aloe can be your new best friend in summer. It is a known anti-inflammatory agent that also provides moisturizing relief. Using products containing aloe vera after sun exposure will calm and soothe your skin, leaving you far less likely to get that awful flaky skin that comes with summer. They are also said to contain antioxidants that can help repair damaged skin and prevent free radicals from doing their unwanted work. Keep an aloe vera plant in your yard or even in your kitchen and use it as needed!
Invest in moisturizers that work on wet skin when it is best absorbed. Don't skip hydrating after your bath! Many brands now offer body washes that provide hydration through oily ingredients, and many apply before you even towel off.
Buy quality sunscreen. Look beyond SPF and buy quality sunscreens with safe ingredients. Reapply every hour or so, and if you take a dip in the water, reapply when you get out. Water attracts the sun (like snow), creating a glare that can cause sunburn.