Dermatitis is inflamed, irritated skin that typically appears as red, scaly, or flaky patches, often with itching. But the exact look varies widely depending on the type of dermatitis, where it shows up on the body, your skin tone, and whether it’s a fresh flare or a long-standing problem. Here’s how to recognize the most common forms.
Atopic Dermatitis (Eczema)
Atopic dermatitis is the most common type, and its appearance shifts with age. In infants, it tends to show up as widespread patches of red, weepy, oozing skin, most often on the face and the outer surfaces of the arms and legs. In childhood, those patches become drier and lighter in color, with a rough texture and early signs of skin thickening. By the teen and adult years, the rash favors the inner creases of the elbows and knees, along with the face, hands, and trunk.
During an active flare, atopic dermatitis looks like poorly defined patches of redness dotted with small raised bumps that may leak fluid. The skin around the patches is often dry and rough. About half of adults with atopic dermatitis also develop dark circles under the eyes, and many notice extra lines on their palms, small bumps on the upper arms (sometimes called “chicken skin”), or dry, cracked lips.
Contact Dermatitis
Contact dermatitis comes in two forms that look similar at first glance but behave differently over time.
Irritant contact dermatitis happens when something directly damages the skin, like harsh soap, bleach, or prolonged wet work. The rash appears quickly, usually within hours. Acute cases produce sharply bordered redness, blisters, or even raw erosions exactly where the irritant touched the skin. It stays put and doesn’t spread. When it becomes chronic (from repeated low-level exposure), the borders blur and the skin becomes dry, scaly, and thickened.
Allergic contact dermatitis is an immune reaction to something like nickel, poison ivy, or fragrance. It takes longer to develop, typically 24 to 72 hours after exposure. The rash starts with poorly defined redness and swelling at the contact site, sometimes with blisters in severe cases. The key visual difference: allergic contact dermatitis tends to spread beyond the original area over days, sometimes popping up on skin that never touched the allergen. Chronic cases become symmetric, with faint borders and small scattered blisters at distant sites.
Seborrheic Dermatitis
Seborrheic dermatitis targets oily areas: the scalp, eyebrows, sides of the nose, behind the ears, eyelids, and chest. It produces greasy-looking patches covered with flaky white or yellow scales. On the scalp, it’s the condition behind persistent dandruff. On the face, it often traces the creases beside the nose and along the eyebrow line. Unlike atopic dermatitis, the patches have a distinctly oily sheen rather than a dry, rough feel.
Nummular Dermatitis
Nummular dermatitis is one of the easiest types to identify visually. It forms round or oval, coin-shaped patches ranging from 1 to 10 centimeters across. The patches are sharply defined, red, and symmetrically distributed, most commonly on the arms and legs. Early on, they may start as clusters of tiny blisters or bumps that merge together. As they mature, the surface can weep clear fluid and develop a crust. If the patch becomes infected, the ooze turns cloudy and the crusting becomes thicker and golden.
Dyshidrotic Dermatitis
This type is limited to the palms, sides of the fingers, and soles of the feet. Its hallmark is clusters of small, deep-set blisters that look like tiny beads of tapioca pudding embedded under the skin surface. They’re firm to the touch and intensely itchy. Individual blisters can merge into larger fluid-filled areas. Once the blisters dry out over a week or two, the skin peels and cracks, leaving it raw and tender before the cycle starts again.
Stasis Dermatitis
Stasis dermatitis develops on the lower legs when circulation slows and fluid pools around the ankles. It appears most often around the inner ankle bone and can extend up toward the shin. Early on, it looks like poorly defined reddish, scaly patches with noticeable itching. Over time, the hallmark sign emerges: brown speckles scattered across the affected skin, caused by iron deposits from leaking blood vessels. In advanced cases, the lower leg develops a hardened, woody texture and the calf may narrow while the ankle swells, creating a shape sometimes described as an “inverted champagne bottle.”
How Dermatitis Looks on Darker Skin
Most medical descriptions of dermatitis reference redness, but on medium to dark skin tones, that redness doesn’t always show up the same way. Instead of bright red, inflamed patches may appear pink, purplish, violet, grayish, or simply darker than the surrounding skin. Seborrheic dermatitis, for example, can look white or purplish rather than red on darker skin. This difference matters because it can delay recognition. After a flare resolves, darker skin tones are also more prone to lasting dark spots (post-inflammatory hyperpigmentation) or lighter patches where the rash was, even after the dermatitis itself has healed.
Acute Versus Chronic Dermatitis
Regardless of type, dermatitis looks different depending on how long it’s been present. Acute dermatitis is wet, angry, and active: redness, swelling, oozing, and small blisters. Chronic dermatitis is dry and thick. The skin develops a leathery texture with exaggerated creases and lines, a change called lichenification. It can look like tree bark, with deepened skin markings and a darkened, tough surface. This thickening is the skin’s response to weeks or months of scratching and rubbing, and it can develop in any type of dermatitis that persists long enough.
Signs of Infection
Broken, inflamed skin is vulnerable to bacterial infection, and knowing what that looks like can help you catch it early. The telltale sign is honey-colored or golden crusting on top of the existing rash. You may also notice sores that break open and leak cloudy or pus-like fluid, increased pain or tenderness rather than just itching, and spreading redness beyond the original patch. Infected dermatitis typically worsens rapidly rather than following the usual slow wax-and-wane pattern.