Pimples range from tiny skin-colored bumps to deep, painful lumps, and their appearance depends on what’s happening beneath the surface. Some have no redness at all, while others are inflamed, swollen, and topped with visible pus. Knowing what each type looks like helps you figure out what you’re dealing with and how to handle it.
Whiteheads and Blackheads
The mildest pimples aren’t red or painful. They’re caused by clogged pores without any significant inflammation, and they come in two forms.
Whiteheads (closed comedones) are small bumps covered by a thin layer of skin. They appear white or slightly yellowish because the plug of oil and dead skin cells sits just below the surface, sealed off from the air. They vary in size but are typically small, and you might only notice them in certain lighting or when you run your fingers across your skin.
Blackheads (open comedones) look like tiny dark specks sitting in your pores. Despite how they look, the dark color isn’t dirt. The pore is open to the air, and the oil plug oxidizes on contact, turning brown or black. They’re flat or only slightly raised, most common on the nose, chin, and forehead.
Red Bumps and Pus-Filled Pimples
When bacteria get involved and your immune system responds, pimples become inflamed. These are the ones most people picture when they hear the word “pimple.”
Papules are solid, inflamed bumps that are red or pink, tender to the touch, and don’t have a visible center of pus. They feel like small, firm lumps under the skin. You can’t pop them because there’s nothing to squeeze out yet. Papules sometimes resolve on their own, or they progress to the next stage.
Pustules look like papules that have developed a white or yellow tip filled with pus. This is the classic “ready to pop” pimple. The base is red and swollen, and the pus-filled head sits right at the surface. Squeezing pustules can push bacteria deeper into the skin, so resist the urge even though they look like they’re asking for it.
Deep, Painful Lumps
The most severe pimples form deep below the surface and can take weeks to resolve.
Nodules are hard, painful lumps that develop well beneath the skin. On the surface, they appear as red bumps, but when you press on them they feel like firm knots. They don’t come to a head the way pustules do, and they’re significantly more painful than typical pimples. Nodules can linger for weeks and often leave marks or scars.
Cysts are similar to nodules but filled with fluid. They tend to feel softer when pressed, though they’re equally painful. Cystic pimples can be large and visibly swollen, sometimes creating a noticeable lump that distorts the skin’s surface. Both nodules and cysts are the types most likely to cause permanent scarring.
How Mild, Moderate, and Severe Acne Differ
A single pimple is one thing, but the overall pattern matters too. One commonly used classification counts inflammatory lesions on half the face: 0 to 5 is mild, 6 to 20 is moderate, 21 to 50 is severe, and more than 50 is very severe. Mild acne typically consists of whiteheads, blackheads, and a few papules. Moderate acne mixes in more pustules across wider areas. Severe acne involves nodules or cysts, widespread inflammation, and a higher risk of scarring.
Another hallmark of acne is variety. A typical breakout includes a mix of different lesion types at the same time: a few blackheads here, a pustule there, a healing flat mark somewhere else. This mix of shapes and stages is actually one of the defining visual features of acne, and it’s useful for telling acne apart from conditions that mimic it.
What Pimples Are Often Confused With
Several other skin issues look similar to pimples but aren’t the same thing.
Folliculitis produces bumps that look like acne but behave differently. The key visual difference is uniformity. While acne creates a mix of lesion types (blackheads, papules, pustules at different stages), folliculitis produces bumps that all look the same. They’re small, similarly sized papules or pustules centered around hair follicles, often appearing on the chest, back, or shoulders. If your breakout looks unusually uniform, it may not be acne.
Sebaceous filaments are frequently mistaken for blackheads, especially on the nose. They look like small dark spots, but they’re usually flat, smaller, and lighter in color than true blackheads, appearing gray, light brown, or yellowish rather than distinctly black. If you squeeze one, a thin, waxy thread comes out rather than the dark, solid plug you’d get from a blackhead. Sebaceous filaments are a normal part of your skin’s oil-transport system and aren’t a form of acne.
Milia look like tiny whiteheads, but they’re harder and won’t respond to the same treatments. They’re small, firm, white bumps made of trapped keratin (a structural skin protein) sealed beneath the surface. Unlike whiteheads, which contain soft oil and dead skin that can be drawn out, milia are solid and have no opening to the surface. They’re most common around the eyes and cheeks.
What Pimples Look Like as They Heal
Even after a pimple flattens and the bump disappears, it often leaves a visible mark. These marks aren’t scars in most cases, but they can stick around for weeks or months.
On lighter skin, healing pimples commonly leave pink or red flat spots called post-inflammatory erythema. The redness comes from blood vessels that dilated during the inflammation and haven’t fully returned to normal. These marks fade gradually but can persist for months, especially without sun protection.
On darker skin tones, the more common aftermath is a flat brown or dark brown spot, known as post-inflammatory hyperpigmentation. Inflammation triggers the skin to produce extra melanin in that area, leaving a discolored patch that can take even longer to fade. In some cases, the opposite happens: the inflamed area loses pigment and appears lighter than the surrounding skin, though this is less common.
Sometimes a healing pimple stays slightly raised even after the redness fades, forming a brown or dark-brown bump. This represents a transitional phase between active inflammation and either a flat dark spot or a scar. Deep or repeatedly irritated pimples are the most likely to leave lasting texture changes, including depressed scars (small pits or indentations) or, less commonly, raised scars from excess collagen production.