1. Summer Bummer: Breakouts
In hot weather, your skin's oil production tends to increase, potentially causing blemishes on your face and body, says Scottsdale, Arizona, dermatologist Jennifer Linder, MD.

Your Prevention Plan: Use a noncomedogenic sunscreen, like La Roche-Posay Anthelios 60 Cooling Water-Lotion Sunscreen. Before you reapply, wipe your face with a cleansing towelette (such as Neutrogena Naturals Purifying Makeup Remover Cleansing Towelettes), says New York City dermatologist Francesca Fusco, MD. Spot-treat facial blemishes with a salicylic acid or benzoyl peroxide product (like Olay Fresh Effects Clear Skin 2-in-1 Salicylic Acid Acne Spot Treatment). Sensitive skin? Choose a salicylic acid treatment with anti-inflammatory azelaic acid (PCA Skin Acne Gel is a good one). For body breakouts, try a benzoyl peroxide cleanser (such as Jan Marini Benzoyl Peroxide 2.5% Wash), says Linder.

2.Summer Bummer: Dry Skin
It's usually the result of too much time in the water or chlorine exposure.

Your Prevention Plan: Shower only once a day, and exfoliate with a scrub to allow your moisturizer to penetrate better (we love Jo Malone London Geranium & Walnut Body Scrub). Use a cream containing hyaluronic acid or glycerin (like Curel Rough Skin Rescue Smoothing Lotion). If you're a swimmer, says Linder, rinse with a creamy hydrating cleanser (such as Dove Go Fresh Revitalize Body Wash) as soon as you get out of the pool.

3. Summer Bummer: Those Little Red Bumps
You're probably shaving more frequently, which means you're more prone to developing folliculitis (inflammation of the hair follicles).

Your Prevention Plan: Avoid rich lotions right after shaving, which could irritate, and cleanse with an antibacterial soap (like Cetaphil Gentle Cleansing Antibacterial Bar), says Fusco. Use a redness-relief moisturizer on problem spots (we suggest Clinique Redness Solutions Daily Relief Cream).

4. Summer Bummer: Hyperpigmentation
No matter how careful you are with the SPF, you might notice dark spots—possibly the result of prior unprotected sun exposure.

Your Prevention Plan: Strengthen your UV defense by pairing your sunscreen with a vitamin C serum, says Linder. Look for one that contains L-ascorbic acid (try SkinMedica Vitamin C+E Complex). To fade brown spots, apply a 2 percent hydroquinone cream (like Glytone Clarifying Skin Bleaching Fading Lotion), Linder says.

5. Summer Bummer: Heat Rash
Things get itchy when sweat glands are blocked, trapping perspiration beneath the skin.

Your Prevention Plan: Exfoliate daily with a mild scrub (such as Kiehl's Gently Exfoliating Body Scrub), says Fusco. As soon as you notice any itchiness, apply a cold compress; then dab on 0.5 percent hydrocortisone cream and moisturize with a lotion containing aloe, feverfew, or calendula (try Burt's Bees Soothingly Sensitive Aloe & Buttermilk Body Lotion).

6. Summer Bummer: Cold Sores
Sunlight can trigger an outbreak: It decreases your immune system's ability to fight the HSV-1 virus.

Your Prevention Plan: Wear a sun hat on beach days to shield your lips from UV rays. A lysine supplement may also help prevent sores, says Fusco. If you have frequent flare-ups, Linder recommends taking an oral medication, like acyclovir, before prolonged sun exposure.

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