A seed wart is a small, flesh-colored bump with a rough, grainy texture and distinctive black dots scattered across its surface. Those black specks are what give the wart its name: they look like tiny seeds embedded in the skin, but they’re actually small blood vessels (or clotted blood) that supply the wart with nutrients. Seed warts range from pinhead-sized to about the size of a pea, and they feel hard and rough to the touch.
The Black Dots That Define Seed Warts
The most recognizable feature of a seed wart is the sprinkling of dark dots on its surface. These aren’t seeds or dirt. They’re tiny blood vessels that have grown into the wart tissue, sometimes with small clots inside them. Under magnification, each dot sits at the center of a small raised bump (called a papilla) surrounded by a whitish ring. You might see just a few dots or dozens, depending on the wart’s size and how long it’s been growing.
Not every wart develops visible black dots right away. Early on, a wart may just look like a small, rough bump that’s slightly raised from the surrounding skin. As it matures and more blood vessels grow into it, the characteristic “seeds” become easier to spot.
Where They Show Up and How They Vary
Seed warts most commonly appear on the fingers, the backs of the hands, and around the fingernails. They’re caused by certain strains of human papillomavirus (HPV) that enter through tiny breaks in the skin, which is why the hands are prime territory.
On the hands and fingers, seed warts typically grow outward as raised, dome-shaped bumps. The surface looks rough and slightly cauliflower-like, with those telltale dark dots. The surrounding skin may appear slightly lighter or thicker than normal.
When the same type of wart appears on the soles of the feet (a plantar wart), it looks quite different. The pressure from walking pushes the wart inward instead of outward, so it grows flat or even recessed into the skin. Plantar seed warts develop a tough, thick surface that can feel like stepping on a pebble. The black dots are still there, but they may be harder to see beneath the thickened skin. One key identifier: the normal lines on the sole of your foot (like fingerprint ridges) will be interrupted where the wart is, rather than running smoothly through it.
How to Tell It Apart From a Callus or Corn
Because seed warts on the feet are flat and thick, they’re easy to confuse with calluses or corns. Here’s how to tell the difference:
- Black dots: Calluses and corns never have dark specks. If you see black dots on the surface, it’s likely a wart.
- Skin lines: A callus preserves the normal skin ridges across its surface. A wart disrupts them, creating a clear boundary where the lines stop.
- Pain pattern: Corns tend to hurt most when you press directly down on them. Plantar warts often hurt more when you squeeze them from the sides.
- Texture: Calluses are smooth and uniformly thick. Warts have a grainier, more irregular texture, sometimes with tiny raised bumps visible on the surface.
Skin tags, another common look-alike, are soft, smooth, and hang from a thin stalk. Seed warts are firmly attached to the skin, feel hard, and have that unmistakable rough surface.
What Causes Them
Seed warts are caused by HPV, specifically strains that infect the outer layer of skin. The most common culprits are HPV types 2, 27, and 57 for warts on the hands, while HPV type 1 is more often responsible for plantar warts in children. The virus enters through small cuts, hangnails, or areas where skin has been broken, which is why people who bite their nails or have dry, cracked hands are more prone to them.
They spread through direct skin contact or by touching contaminated surfaces like shared towels, gym floors, or pool decks. You can also spread warts to other parts of your own body by touching or picking at them. The virus can take weeks or even months to produce a visible wart after initial infection, so you may not know where you picked it up.
How They Change Over Time
A seed wart often starts as a small, smooth bump that’s barely noticeable. Over weeks to months, the surface roughens, the wart grows slightly, and the black dots become visible. Some warts stay small and solitary. Others multiply into clusters, especially if you pick at them or the virus spreads to nearby skin.
Many seed warts eventually go away on their own as the immune system clears the virus, but this can take months to a couple of years. Over-the-counter treatments containing salicylic acid work by gradually peeling away the wart tissue layer by layer, and they’re effective for most common seed warts. Warts that are large, painful, spreading, or located on the face or genitals typically need professional treatment, which may involve freezing, stronger topical solutions, or minor procedures to remove the tissue.
A wart that changes color dramatically, bleeds without being picked at, or grows rapidly may warrant a closer look from a dermatologist to rule out other skin conditions.