Always Patch Test Your Skincare!
Costalgia’s Skin Diaries — Entry 2: Always Patch Test First
Why a tiny test today can save your skin tomorrow.
Trying a new skincare product can be exciting—especially when it promises brighter, smoother, healthier skin. But here’s the truth: even the most gentle or “hypoallergenic” formula isn’t guaranteed to work for everyone. Every skin type has its own quirks, sensitivities, and limits.
That’s why patch testing isn’t just for people with “sensitive skin”—it’s a smart step for every skin type.
Why Patch Testing Matters
Your skin is unique. A product that feels like a miracle for one person could cause redness or irritation for another. Patch testing lets you see how your skin reacts before applying it to your face, reducing the risk of unwanted reactions like:
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Redness or rashes
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Itching or tingling
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Breakouts or small bumps
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Dryness or peeling
Hypoallergenic ≠ Risk-Free
Labels like “hypoallergenic” mean a product is less likely to cause an allergic reaction, but they don’t mean it’s impossible. Skincare is personal—and your skin’s reaction depends on factors like your barrier health, climate, and even your current routine.
A Note About Our Vitamin C Ampoule
Our ampoule contains 30% pure concentrated Vitamin C, which makes it incredibly effective for brightening, improving uneven tone, and supporting collagen production. However, its potency can cause a mild tingling or redness—especially if:
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Your skin is very dry
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You’re new to Vitamin C
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Your barrier is weakened from over-exfoliation or irritation
That’s why we always recommend patch testing first.
How to Patch Test Like a Pro
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Choose a small area — Apply the product to your inner arm or behind your ear.
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Wait 24 hours — This allows delayed reactions to show.
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Check for irritation — If you see redness, itching, or swelling, avoid applying to your face.
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Introduce slowly — If there’s no reaction, start using the product 2–3 times a week before building up.
Final Note
A few minutes of patch testing can save you days—or even weeks—of irritation. It’s the simplest way to protect your skin, especially when trying powerful formulas like our waterless 30% Vitamin C Ampoule.
Your skin deserves the chance to adapt gently—because healthy skin isn’t just about results, it’s about care.
