As temperatures rise, so does the flood of recycled summer skincare advice: reapply your SPF, stay hydrated, and wear a hat. Board-certified dermatologist Annette Czernik, M.D., says, “the tips consumers need are the ones they’re not hearing. From the hidden dangers of air conditioning to why your post-workout skincare routine matters as much as your workout itself, the real threats to summer skin go well beyond sun exposure.”
Here, Czernik shares lesser-known, often surprising, guidance that can make a meaningful difference in skin health this summer.
Sun Protection: What You’re Getting Wrong
Your SPF is probably expired, and you’d never know.
Most people don’t check the period after the opening symbol on their sunscreen. SPF degrades once opened, and last summer’s bottle that sat in a hot car? Essentially useless. Look for the open jar symbol on packaging, and replace accordingly.
Sunscreen goes on before moisturizer, unless it’s chemical.
Mineral SPF sits on top of skin and should be the final step. Chemical SPF needs to absorb into the skin and should go on before moisturizer. Most people do neither correctly, and the order entirely changes efficacy.
Lips are the most neglected UV target.
The lower lip receives direct sun exposure at an angle most people never consider. It’s one of the more common sites for actinic keratosis and squamous cell carcinoma, but almost no one applies SPF lip products consistently. The lower lip is a high-risk location for squamous cell carcinoma that carries a significant risk of deadly spread. Always carry an SPF lip balm all summer long.
Beyond SPF: The Summer Skin Disruptors No One Talks About
Summer humidity can wreck your skin barrier, not save it
Most people assume humid air means hydrated skin. The opposite can happen—humidity draws water out of skin if your barrier is compromised, and switching to lighter products without enough occlusives can leave skin more dehydrated by August than February.
Post-workout skin is uniquely vulnerable
Washing your face immediately after a workout isn’t just about sweat, it’s about catching skin during a window when it’s more reactive, and pore-clogging is accelerated. Sweat can trigger yeast growth, acne, and eczema flare-ups. A cool water rinse followed by a moisturizer will help calm skin down and protect it.
Swimming pools are an underrated skin disruptor
Chlorine strips the microbiome and compromises the skin barrier, leaving skin more vulnerable. Rinsing immediately after and applying barrier-repair is more important than most people realize.
Your hair products are causing your jawline and forehead breakouts
Sweat activates whatever is in your hair—dry shampoo, oils, and styling products—and it migrates onto skin throughout the day. The hair product-to-acne connection is something most consumers have never been told directly.
Summer is Time to Reset Your Skin Routines
Your retinol habit doesn’t need to stop in summer, it needs to adapt.
The “no retinol in summer” advice is outdated. The real guidance: apply at night, follow with SPF in the morning, and switch to a lower concentration if you’re getting a lot of sun. Abandoning it entirely means losing months of progress.
Antioxidants belong in the morning, not at night.
Vitamin C and other antioxidants work synergistically with SPF to neutralize free-radical damage from UV exposure. They’re most effective when worn during the day, not as a nighttime treatment, which is how most people use them.
Exfoliate the face less in summer
Many people think summer calls for more exfoliation because of sweat and congestion. But in months with strong UV exposure, over-exfoliating can increase sensitivity and the risk of hyperpigmentation. A better approach is to exfoliate just once a week and focus on repairing the skin barrier.
Summer breakouts aren’t always acne—they might be fungal
Heat and sweat create the perfect environment for Malassezia (pityrosporum folliculitis), a fungal overgrowth that mimics acne but does not respond to traditional acne treatments. It presents as clustered, itchy bumps most commonly on the forehead, chest, and back.
