Pigmentation on the skin shows up as patches or spots that are darker, lighter, or a different color than your surrounding skin. The exact appearance varies widely depending on the type and cause, but most pigmentation falls into recognizable visual patterns: flat brown or tan spots from sun exposure, symmetrical patches across the cheeks or forehead, dark marks left behind after acne or injury, or pale white areas where color has been lost entirely. Here’s how to identify what you’re seeing.
How Skin Color Works
Your skin color comes from a pigment called melanin, produced by specialized cells that sit in the deepest layer of your outer skin. Each of these pigment-producing cells serves about 30 to 40 surrounding skin cells, passing tiny packets of melanin into them. Those packets cluster above the nucleus of each cell like a miniature umbrella, shielding your DNA from UV damage. When this system overproduces melanin in one area, you get a darker spot. When it underproduces or stops entirely, you get a lighter one.
Dark Spots and Patches
The most common form of pigmentation is hyperpigmentation, where areas of skin turn darker than your natural tone. These spots and patches can range from tan and brown to deep brown, black, gray, or even blue-gray, depending on how deep the extra melanin sits in your skin. On darker skin tones, pigmentation can also appear as deep purple or ashy gray rather than the typical brown that shows up on lighter skin.
Hyperpigmented areas are usually flat to the touch. They don’t feel raised, bumpy, or textured. This flatness is one of the easiest ways to distinguish simple pigmentation from other skin growths. If a dark spot feels waxy, rough, or “stuck on” to the skin surface, it may be a different type of lesion, such as a seborrheic keratosis, rather than straightforward pigmentation.
Sun Spots and Age Spots
Solar lentigines, commonly called sun spots or age spots, are among the most recognizable forms of pigmentation. They appear as flat, well-defined spots that range from skin-colored or tan to dark brown or black. Size varies from a few millimeters (smaller than a pencil eraser) to several centimeters across. They show up on areas that get the most sun exposure over a lifetime: the backs of your hands, forearms, face, chest, and shoulders. The edges are usually smooth and clearly defined, and the color within a single spot tends to be fairly uniform.
Melasma’s Symmetrical Pattern
Melasma looks distinctly different from scattered sun spots. It appears as larger, irregularly bordered patches of brown or grayish-brown skin, and its hallmark is symmetry. If you have a patch on one cheek, you almost certainly have a matching one on the other. It’s far more common in women and in people with darker skin tones.
The patches follow three main patterns on the face. The most common, affecting 50 to 80 percent of cases, is the centrofacial pattern, which spreads across the forehead, nose, upper lip, and chin. The malar pattern is limited to the cheekbones. The mandibular pattern follows the jawline. In all three, the patches have a net-like or blotchy quality rather than looking like solid, uniform color. The borders fade gradually into the surrounding skin rather than ending in a sharp line.
Marks Left After Inflammation
Post-inflammatory hyperpigmentation (PIH) is the dark discoloration that lingers after acne, eczema, burns, cuts, or any skin injury heals. These marks sit in the exact footprint of the original inflammation, so they mirror the shape of whatever caused them. A row of acne spots along your jawline, for example, leaves a matching row of dark marks.
The color tells you how deep the pigment sits. Shallow pigment in the upper skin layers looks tan, brown, or dark brown. Deeper pigment, pushed down by more severe or longer-lasting inflammation, takes on a blue-gray tone. This distinction matters because surface-level marks tend to fade on their own over months, while the blue-gray variety is more stubborn and can persist for years. In all cases, the marks are flat and painless once the underlying inflammation has resolved.
Light or White Patches
Not all pigmentation is dark. Vitiligo causes smooth, milk-white patches where the skin has completely lost its color. These patches can appear anywhere on the body, including the face, hands, arms, and areas around body openings. The contrast is most visible on darker skin, but on any skin tone, the patches are noticeably lighter than the surrounding area. The edges of vitiligo patches can be well-defined or slightly blurred, and the affected skin feels completely normal to the touch, with no scaling or roughness.
Other conditions can also cause lighter patches. Fungal infections sometimes leave pale, slightly scaly spots, while certain types of eczema can temporarily reduce pigment in affected areas. The key visual difference is that vitiligo patches are distinctly white, not just a shade or two lighter, and the skin texture remains smooth.
How Pigmentation Looks on Different Skin Tones
The same type of pigmentation can look quite different depending on your natural skin tone. On lighter skin, hyperpigmentation typically appears as brown or tan spots that contrast sharply against the surrounding skin. On medium skin tones, the same condition might look dark brown or slightly grayish. On the darkest skin tones, pigmentation can present as deep brown, black, gray, or even purple-toned patches. The fundamental pattern and shape remain the same, but the color shifts.
This variation means that pigmentation in darker skin is sometimes mistaken for bruising, or overlooked entirely because the contrast between affected and unaffected skin is more subtle. Gray or ashy tones in particular are common in deeper skin tones and can indicate that pigment has settled into the deeper layers of the skin.
When a Spot Looks Suspicious
Most pigmentation is harmless, but certain visual features suggest something more serious. The National Cancer Institute uses the ABCDE criteria to flag spots that may warrant closer evaluation:
- Asymmetry: one half of the spot doesn’t mirror the other half.
- Border irregularity: the edges are ragged, notched, or blurred, with pigment seeming to bleed into surrounding skin.
- Color variation: multiple shades within a single spot, including combinations of brown, black, tan, white, gray, red, pink, or blue.
- Diameter: the spot is larger than about 6 millimeters (roughly the size of a pencil eraser), or it’s growing.
- Evolving: the spot has changed in size, shape, or color over recent weeks or months.
A benign age spot or melasma patch stays stable. It doesn’t sprout new colors, develop jagged borders, or grow noticeably over a short period. Any spot that checks multiple boxes on this list looks different from your other spots, or is changing visibly over time, is worth having a professional examine.