Dry vs dehydrated skin: how to tell the difference

Key takeaways

• In skincare, “dry” usually describes skin that’s short on oils and lipids, while “dehydrated” describes skin that’s short on water. The split is a skincare convention rather than a medical diagnosis, and plenty of people have both.

• Dry skin tends to look rough, flaky or scaly. Dehydrated skin tends to feel tight and look dull, and it can happen to oily skin too.

• The popular pinch test isn’t a reliable way to tell them apart.

• Most skin that feels dry or tight does best with a mix of humectants (like glycerin or hyaluronic acid) and an occlusive (like petrolatum) to hold water in.

• Short, warm showers, moisturizing while skin is still damp, fragrance-free products and a humidifier help either way.

What’s the difference between dry and dehydrated skin?

Medically, dry skin is simply dry skin. Cleveland Clinic explains that “the medical term for dry skin is xeroderma,” and describes it as “rough patches of your skin that can flake or look scaly.” Neither Cleveland Clinic nor the American Academy of Dermatology (AAD) has a page on “dehydrated skin” as a separate condition.

Skincare brands draw a line between the two anyway, and it’s a useful way to think about what your skin needs:

• Dry skin is usually described as a skin type that makes less oil. The lipids that help hold water in are in short supply, so skin feels rough and often flakes.

• Dehydrated skin is usually described as a temporary state where the outer layer of skin is short on water. It can happen to any skin type, including oily skin, and it tends to come and go with the weather, your routine and your environment.

In practice, they overlap, and it’s common to have both. Research shows that the outer layer of skin starts to show visible dryness when its water content drops below about 10%, and a 2019 position paper on dry skin recommends products that contain “both rehydrating and lipid-replenishing components.” Skin that lacks oil loses water more easily, so treating one usually helps the other.

Signs of dry skin

• Rough, flaky or scaly patches.

• Itching. The AAD notes that “dry skin can flake, itch, crack, and even bleed.”

• Cracks, especially on the hands, heels and shins. Cleveland Clinic says severe dry skin may crack and bleed.

• A tight feeling that doesn’t go away with a light moisturizer.

Cleveland Clinic suggests one simple check: lightly drag your fingernails across your arm or leg without pressing. If the skin flakes, or you see a light chalk-like line, your skin is dry.

Signs of dehydrated skin

These come from skincare brands rather than medical sources, so treat them as a rough guide:

• A tight feeling, often after cleansing.

• A dull, tired look.

• Fine lines that look more noticeable than usual.

• Skin that feels oily and dry at the same time.

Is the pinch test real?

Not really. You’ll see it recommended often: pinch the skin on your cheek or the back of your hand, and if it’s slow to bounce back, your skin is supposedly dehydrated. The medical version, called a skin turgor test, is meant to check for dehydration in the whole body, not in the surface of your skin. Even for that, a review in JAMA found that in adults, poor skin turgor has “no proven diagnostic value.” Skin also gets less springy with age, which a pinch test can’t separate from hydration.

What causes dry and dehydrated skin?

Many of the same things drive both:

• Low humidity and indoor heat. The AAD says that when the air contains little humidity, it’s common to develop dry skin, and that indoor heating can rob skin of moisture.

• Hot water and overwashing. Cleveland Clinic lists washing too often or using water that’s too hot.

• Harsh products. The AAD recommends avoiding products with alcohol and fragrance while your skin is dry, and Cleveland Clinic suggests avoiding isopropyl alcohol and sulfates.

• Age. Cleveland Clinic notes that the skin’s oil glands become less active as you get older.

• Medical conditions and medicines. The AAD links persistent dry skin to conditions such as atopic dermatitis, psoriasis and kidney disease.

Our guide to repairing a damaged skin barrier covers what happens when harsh products and overwashing go further than dryness.

How to treat dry and dehydrated skin

The fix for both starts with the right moisturizer. Moisturizing ingredients do three different jobs, and a review of moisturizers explains how they work together:

• Humectants draw water into the outer layer of skin. Glycerin, hyaluronic acid, panthenol and urea are common examples, and the 2019 position paper says urea has “the best evidence by far.” Humectants can also increase water loss on their own, so they work best paired with an occlusive.

• Occlusives form a layer on top of skin that slows water loss. The review calls petrolatum “the most effective classic occlusive moisturizer.”

• Emollients fill in the gaps between skin cells and help smooth rough texture. Plant oils like jojoba, silicones like dimethicone and ceramide-like ingredients fall into this group.

If your skin mainly feels tight and dull, a lighter humectant-rich moisturizer may be enough. If it’s rough and flaky, choose a richer cream or ointment with occlusives. The AAD notes that ointments and creams “are more effective than lotions.” For oily skin that still feels tight, a light, oil-free gel moisturizer is a good middle ground; our list of the best moisturizers for oily skin covers options.

Everyday habits that help

These tips come from the AAD’s advice for dry skin:

• Keep showers short and warm. The AAD suggests five to 10 minutes with warm water rather than hot.

• Moisturize while your skin is still damp. Pat skin dry and apply moisturizer immediately.

• Choose fragrance-free products. The AAD notes that “unscented” products can still contain chemicals that hide odors.

• Run a humidifier. The AAD suggests using one in your bedroom overnight and cleaning it regularly to prevent mold.

• Wear sunscreen every day. The AAD recommends a broad-spectrum SPF 30 or higher as part of daily dry-skin care.

The AAD says that when self-care is working, you tend to see improvement within two weeks.

When to see a dermatologist

If your skin is still dry after trying these steps, the AAD recommends seeing a board-certified dermatologist, because overly dry skin can be a sign of an underlying condition such as atopic dermatitis, psoriasis or kidney disease. Cleveland Clinic also advises seeing a doctor if dry skin doesn’t go away or keeps coming back, or if it itches constantly, is painful or looks infected.

Frequently asked questions

How do I know if my skin is dry or dehydrated?

Look at how it behaves. It’s usually dry if you see rough, flaky or scaly patches. Tightness and dullness, especially if your skin is also oily, point to dehydration. Many people have a bit of both, and the same moisturizing routine helps either way.

How do you fix dehydrated skin?

Use a moisturizer with humectants like glycerin or hyaluronic acid, and seal it in with an occlusive ingredient such as petrolatum or dimethicone. Keep showers short and warm, and apply moisturizer while your skin is still damp.

Will drinking more water fix dry skin?

Probably not, at least not on its own. One small study of 49 young women found that drinking an extra 2 liters of water a day for 30 days improved skin hydration, mainly in people who drank little to begin with. A systematic review found the evidence weak and said more research is needed on whether drinking more water eases dry skin, so moisturizing your skin directly is the surer bet.

Can oily skin be dehydrated?

It can. Skincare brands describe dehydration as a lack of water rather than oil, so skin can feel greasy and tight at the same time. A light, oil-free moisturizer with humectants is a good starting point.

What does dehydrated skin look like?

It’s usually dull and tired-looking, and fine lines can look more obvious than usual. It often feels tight, especially after cleansing.