“Ojo de pescado” is the common Spanish term for a plantar wart, a hard growth that develops on the sole of the foot after infection with the human papillomavirus (HPV). The name translates to “fish eye,” describing the round, slightly raised bump with a center that resembles a fish’s eye. These warts are not dangerous, but they can cause real pain when you walk, especially if they grow on a weight-bearing part of your foot like the heel or ball.
What Causes It
Plantar warts are caused by specific strains of HPV, most commonly types 1, 2, 3, 4, 27, and 57. These strains enter through tiny cuts, cracks, or weakened spots on the bottom of your foot. The virus thrives in warm, moist environments: public swimming pools, gym showers, locker rooms, and shared pool decks are the most common places people pick it up. Walking barefoot in these areas is the primary risk factor.
Once the virus enters the skin, it causes cells in the outer layer to grow rapidly, forming the tough, fleshy bump. It can take weeks or even months after exposure before a wart becomes visible, which makes it difficult to pinpoint exactly where you contracted it. People with weakened immune systems and children are more susceptible, though anyone can develop one.
How to Identify an Ojo de Pescado
A plantar wart has a rough, grainy texture and typically grows inward rather than outward because of the pressure from standing and walking. The most distinctive feature is the cluster of tiny black dots on the surface. These are not seeds or dirt. They are dried blood trapped in small capillaries that feed the wart.
The wart may be surrounded by a ring of thickened, callus-like skin. When you press on it, the pain tends to be sharper if you squeeze the sides rather than pushing directly down on it. This side-squeeze test is one of the simplest ways to tell a plantar wart apart from a corn or callus.
Warts vs. Corns and Calluses
Corns and calluses are thickened patches of dead skin caused by friction or pressure, not a virus. They lack the black dots, don’t have the grainy texture, and their pain pattern is different. A callus generally hurts more with direct pressure, while a plantar wart hurts more with lateral (side-to-side) pressure. Corns also tend to have a smoother, more uniform surface compared to the rough, slightly cauliflower-like texture of a wart.
Do They Go Away on Their Own?
In many cases, yes. In children, 50% of warts disappear within six months without any treatment, and 90% resolve within two years. Adult immune systems tend to be slower at clearing the virus, so warts in adults can persist longer, sometimes for several years. If a wart isn’t causing pain or spreading, waiting it out is a reasonable option, particularly for kids.
That said, plantar warts can grow larger or multiply during the waiting period. Some people develop clusters called mosaic warts, which are harder to treat. If the wart is painful enough to change how you walk, or if it’s been around for more than a year or two without improvement, treatment speeds things up considerably.
Over-the-Counter Treatment
The most widely available home treatment is salicylic acid, sold as liquids, gels, pads, and medicated bandages at most pharmacies. Salicylic acid works by softening and dissolving the infected skin layer by layer, allowing your immune system to reach and attack the virus underneath. Studies combining data from multiple clinical trials show a 73% cure rate with consistent use over 6 to 12 weeks, compared to 48% for a placebo.
The key word is “consistent.” This is not a one-time application. You typically need to apply the acid daily, let it dry, and file away the dead skin with a pumice stone or emery board before each new application. Soaking your foot in warm water for 10 to 15 minutes beforehand helps the acid penetrate deeper. Most people see gradual improvement over several weeks, and the full 12-week course is often necessary for stubborn warts. If you don’t see any change after that period, it’s time to consider professional treatment.
Professional Treatment Options
When over-the-counter methods fail, a podiatrist or dermatologist can offer stronger approaches. The two most common are freezing (cryotherapy) and laser treatment.
Cryotherapy uses liquid nitrogen to freeze and destroy the wart tissue. It’s the most frequently used in-office treatment, but its success rate as a standalone method is around 46%, meaning roughly half of patients need multiple sessions or additional treatment. Each session can cause a blister that takes a few days to heal, and most people require two to four visits spaced a few weeks apart.
Laser treatment targets the blood vessels feeding the wart, cutting off its supply. It has a notably higher cure rate of about 79% based on available data. It tends to cause less surface damage than freezing, though it can still be uncomfortable and may require local numbing. Not every clinic offers laser treatment, and it costs more than cryotherapy.
For warts that resist both of these, doctors may use stronger topical chemicals, immunotherapy injections that provoke a local immune response, or minor surgical removal. Surgery is generally a last resort because the scar tissue on the sole of the foot can itself become a source of long-term discomfort.
Preventing Ojo de Pescado
Since the virus spreads through direct contact with contaminated surfaces, the most effective prevention is keeping your feet covered in shared wet environments. Wear flip-flops or water shoes in pool areas, gym showers, and locker rooms. The virus enters through small breaks in the skin, so keeping your feet moisturized and free of cracks reduces your vulnerability.
If you already have a wart, avoid touching or picking at it, as this can spread the virus to other areas of your foot or to your hands. Use a separate towel for your feet, and don’t share pumice stones or nail files. Keeping the wart covered with a bandage when walking barefoot at home can reduce the risk of spreading it to family members.
Children who spend time at pools or in sports involving shared floor space are especially prone to picking up the virus. Getting them in the habit of wearing shower shoes and drying their feet thoroughly after swimming goes a long way toward prevention.