These treatments are usually reserved for stubborn or recurring cases.

Preventing Plantar Warts

Preventing infection is an important part of managing plantar warts.

Simple habits can significantly reduce the risk of exposure to HPV.

These include:

• Wearing flip-flops or sandals in public showers and locker rooms

• Keeping feet clean and dry

• Avoiding direct contact with someone else’s wart

• Not sharing personal items like shoes, socks, or towels

It is also important not to pick, scratch, or cut a wart, as this can spread the virus to other parts of the foot or to other people.

Covering the wart with a bandage and maintaining good hygiene can help prevent the infection from spreading.

Final Thoughts

The small, rough spot often referred to as a “fish eye” on the bottom of the foot is usually not just a simple callus. In many cases, it is actually a plantar wart caused by a viral infection.

Although these lesions may resemble thickened skin, their cause, structure, and behavior are very different.

Recognizing the signs of plantar warts—such as black dots, disrupted skin lines, and pain when walking—can help people identify the condition early and choose the right treatment.

By understanding how plantar warts develop and how the virus spreads, individuals can take steps to protect their feet and reduce the risk of infection.

While plantar warts are generally harmless, proper care and prevention can help keep them from becoming a persistent or uncomfortable problem.

Fish Eyes on Your Feet: How to Recognize Plantar Warts, Distinguish Them From Calluses, and Treat Them Safely

Small, rough, circular spots on the bottom of the feet are easy to overlook. Many people notice them while showering, changing shoes, or walking barefoot and assume they are simply areas of hardened skin.

In some cases, that assumption is correct. Repeated pressure and friction can cause calluses or corns to develop on the soles of the feet. However, another common possibility is a plantar wart, a viral skin infection that can resemble ordinary thickened skin.

In Vietnam and several other countries, people sometimes call these lesions "fish eyes" because of their rounded appearance and central spot. Although the name sounds harmless, the condition can become uncomfortable, particularly when it develops on areas that bear weight during walking.

Understanding the differences between plantar warts, corns, and calluses can help people choose appropriate care. It can also prevent unnecessary pain, skin damage, and the spread of infection.

1. What Are Plantar Warts?

Plantar warts are small, noncancerous skin growths that develop on the soles of the feet. They are caused by certain types of human papillomavirus, commonly known as HPV.

HPV is a large family of viruses. Different types affect different areas of the body. The HPV types responsible for ordinary plantar warts are generally different from those associated with cervical cancer and several other HPV-related cancers.

When the virus enters the outer layer of the skin through tiny breaks or damaged areas, it can infect skin cells and encourage them to grow more rapidly than usual.

This produces a localized area of thickened, rough skin.

Plantar warts most commonly appear on weight-bearing areas, including:

• The heel.

• The ball of the foot.

• The base of the toes.

• Areas exposed to repeated pressure from footwear.

Because these locations are constantly compressed when standing or walking, the wart may grow inward and become covered by layers of thickened skin.

A plantar wart can appear as a single small lesion or develop alongside several others. Some are barely noticeable, while others become painful enough to interfere with walking.

Although they can be uncomfortable, plantar warts are usually harmless and do not represent a serious internal disease.

2. Why Do Plantar Warts Look Like Small Circular Holes?

The appearance of a plantar wart can be confusing.

Unlike warts on the hands or face, plantar warts are often pressed inward by body weight. The surrounding skin may become thick and hard, making the lesion look like a small circular depression or a compact area of hardened tissue.

Some people notice a rough central area surrounded by a ring of thicker skin.

This appearance can resemble a corn or callus.

The surface may also contain tiny dark dots, which are one of the clues that can suggest a plantar wart.

However, appearance alone cannot establish a diagnosis. Some lesions look similar, and a healthcare professional may need to examine the skin closely.

3. The Truth About the Tiny Black Dots

One of the most recognizable features of some plantar warts is the presence of small black or dark red dots.

These spots are sometimes called "seeds," leading people to believe that the wart contains tiny roots or seeds.

That is not what they are.

The dots usually represent small blood vessels within the wart that have become clotted or developed tiny areas of bleeding.

Because the wart contains these small vessels, the surface may show scattered dark points when the thickened outer skin is examined.

These dots can help distinguish a plantar wart from a simple callus, but they are not always visible.

A person should not try to uncover them by cutting or digging into the lesion. Doing so can cause bleeding, infection, and further skin injury.

4. Do Plantar Warts Really Have Roots?

A common belief is that plantar warts grow deep roots that extend into the foot.

This is a misconception.

Plantar warts do not have roots like plants. They are localized viral growths within the skin.

However, pressure from standing and walking can make the lesion appear deeply embedded. Thickened skin may also develop around it, creating the impression that something is growing beneath the surface.

This explains why some people find plantar warts difficult to remove.

Even when the visible surface becomes smaller, infected skin cells may remain. The wart can therefore persist or return after treatment.

The key is to treat the affected skin appropriately rather than attempting to dig out an imaginary root.

5. Plantar Warts vs. Corns vs. Calluses: What Is the Difference?

One of the most useful things people can learn is how to distinguish these three common foot conditions.

Although they can look similar, their causes are different.

Plantar Warts

Plantar warts are caused by HPV.

Typical features may include:

• A rough, uneven surface.

• Tiny dark dots.

• Disruption of normal skin lines.

• One lesion or several clustered lesions.

• Tenderness when walking or applying pressure.