A forming wart typically starts as a small, flesh-colored bump with a slightly rough or grainy texture. At the earliest stage, it can be as small as a pinhead, and you might mistake it for a pimple, a callus, or just a patch of dry skin. As it develops over days to weeks, the surface becomes noticeably rougher, and tiny black dots may appear. Those dots are clotted blood vessels that have been trapped inside the growing tissue.
How Warts Start Under the Skin
Warts are caused by HPV (human papillomavirus), which enters through tiny cuts, scrapes, or cracks in the outer layer of skin. Once inside, the virus reaches the deepest layer of the skin’s surface and begins hijacking normal cell growth. It produces proteins that override the body’s built-in brakes on cell division, essentially forcing skin cells to multiply much faster than they should. The result is a small mound of excess skin that pushes outward, or in some cases inward, as a wart.
The gap between infection and a visible wart can be surprisingly long. A wart may appear weeks, months, or even years after the initial exposure to the virus. This means you often can’t trace when or where you picked it up.
What a Common Wart Looks Like Early On
Common warts, the type most people picture, usually show up on the fingers and hands. In their earliest stage, they look like small, fleshy, grainy bumps that feel rough when you run a finger over them. The texture is the biggest giveaway. Normal skin bumps like pimples feel smooth on top, while a forming wart has a slightly sandpapery quality almost immediately.
As the wart matures, it grows from pinhead-sized up to roughly the size of a pea. Black dots often become visible, scattered across the surface like tiny seeds. These are sometimes called “seed warts,” but no actual seeds are involved. Each dot is a small blood vessel that has clotted off inside the wart tissue. Not every wart develops these dots right away, but their appearance is one of the most reliable signs you’re dealing with a wart rather than something else.
Plantar Warts on the Feet
Warts on the soles of your feet look different from the start because body weight pushes them inward instead of letting them grow outward. A forming plantar wart often appears as a small, flat, slightly rough patch on the bottom of the foot. You might notice it first as a spot that feels like you’re stepping on a pebble. Over time, the wart develops a thickened, callus-like surface with the same telltale black dots.
Plantar warts can become quite large and painful as they grow deeper into the foot. A related type, mosaic warts, forms on the balls of the feet or under the toes. These start out white, pinhead-sized, and flat. They rarely hurt, but they tend to cluster together and can eventually spread across a wider area of the foot.
Flat Warts: Smaller and Harder to Spot
Flat warts are the sneakiest type to catch early because they barely rise above the skin’s surface. They measure just 1 to 5 millimeters across, no bigger than the head of a pin, and their tops are smooth and flat rather than rough and bumpy. Their color blends in with surrounding skin, though they can have a yellowish, brownish, or pinkish tint.
The most distinctive feature of flat warts is their tendency to appear in clusters. They almost always show up in groups, sometimes 20 or 30 at a time, occasionally more than 100. Common locations include the face, forehead, and backs of the hands. If you notice a patch of tiny, barely raised bumps that all appeared around the same time, flat warts are a strong possibility.
Filiform Warts on the Face
Filiform warts look completely different from other types. Instead of forming a rounded bump, they grow as narrow, finger-like projections that stick straight out from the skin. They tend to appear around the eyelids, lips, nose, and chin. A forming filiform wart may start as a tiny pointed bump that’s the same color as your skin. Because they grow quickly and in visible areas, most people notice them early.
How to Tell a Wart From a Corn or Callus
This is the question that trips people up the most, especially on the feet where warts and corns can look nearly identical at first glance. Both are small, flesh-colored, and rough to the touch. The key differences come down to texture and surface detail.
- Warts have a grainy, fleshy surface with black pinpoints scattered through them. If you look closely, the normal skin lines (like fingerprints) are interrupted or pushed aside by the wart tissue.
- Corns have a hard, raised center surrounded by dry, flaky skin. The skin lines continue right through a corn without being disrupted.
Another simple test: warts tend to be painful when you squeeze them from the sides, while corns hurt more with direct downward pressure. This isn’t a perfect rule, but it holds true often enough to be useful when you’re trying to figure out what’s forming on your skin.
Do Forming Warts Hurt or Itch?
Most warts cause no sensation at all when they first appear. Common warts on the hands are typically painless unless they’re in a spot that gets bumped or pressed frequently, like a fingertip. Plantar warts are the main exception. Because they bear your full body weight, even a small plantar wart can feel tender or produce a sharp, stone-in-shoe sensation when you walk.
Some people report mild itching around a developing wart, but this isn’t a hallmark symptom. If a bump is intensely itchy, red, or inflamed, it’s more likely something other than a wart.
Whether to Treat or Wait
About 65% of warts disappear on their own within two years as the immune system eventually recognizes and clears the virus. For a single, painless wart that isn’t bothering you, watching and waiting is a reasonable approach. Treatment is worth considering if the wart is painful, spreading to other areas, or located somewhere cosmetically bothersome like the face or hands. Treating early, while the wart is still small, is generally easier and faster than waiting until it has grown or multiplied.
One practical concern with leaving warts alone: they can spread to other parts of your body through a process called auto-inoculation. Picking at a wart, biting your nails, or shaving over a wart can transfer the virus to new sites. Keeping the area covered and avoiding touching or scratching a wart reduces that risk.