Most warts are harmless and will eventually clear on their own, but certain changes in how a wart looks, feels, or behaves signal that it’s time to get professional evaluation. The short answer: worry when a wart keeps growing despite treatment, bleeds, changes color or shape, causes pain that limits your daily activities, or shows signs of infection like redness and warmth spreading around it.
Growth That Won’t Stop or Slow Down
A normal wart might grow a bit over the first few weeks, then plateau. What’s not normal is a lesion that keeps getting bigger month after month, especially if you’ve been treating it. In one published case, a 63-year-old man had a lesion on his hand for nine months that was initially biopsied and diagnosed as a common wart. But it continued to enlarge in both height and diameter over the following weeks, and further evaluation revealed it was actually a squamous cell carcinoma, a type of skin cancer.
That’s an uncommon outcome, but it illustrates the key principle: warts that don’t behave like warts deserve a closer look. If you’ve been using over-the-counter salicylic acid products daily for several weeks and the growth hasn’t budged, shrunk, or responded at all, that’s a reasonable point to seek professional treatment. And if the lesion is actively getting larger during treatment, move that timeline up.
Changes in Color, Shape, or Texture
Common warts tend to look like rough, skin-colored or grayish bumps with a consistent texture. When a growth starts changing, pay attention. Specifically, watch for:
- Color shifts: A wart that develops dark spots, turns red, or becomes multi-colored
- Irregular borders: Edges that become ragged or poorly defined instead of maintaining a distinct border
- Unusual center: The central portion losing the typical rough, dotted appearance of a wart
- Bleeding: Spontaneous bleeding without picking or trauma
Skin cancers can masquerade as warts for years. In one case documented in the medical literature, a woman had a growth treated twice with freezing therapy under the assumption it was a wart. It took five years before a biopsy finally revealed squamous cell carcinoma. The takeaway isn’t that your wart is cancer. It’s that a growth which fails repeated standard treatments, or looks different from a typical wart, warrants a biopsy to rule it out.
Signs of Infection
Warts themselves are caused by a virus, but the skin around them can develop a secondary bacterial infection, particularly if you’ve been picking at the wart or using aggressive home treatments. The warning signs of infection are distinct from the wart itself: a spreading area of redness around the base, skin that feels warm or hot to the touch, swelling, and increasing pain. If you notice foul-smelling discharge, that suggests a deeper infection that needs prompt attention.
An infected wart typically hurts more than an uninfected one. But interestingly, if the area around a wart starts feeling numb rather than painful, that can actually indicate a more serious infection that’s damaging the nerves in the surrounding skin. Any combination of redness, warmth, swelling, and pus means the problem has moved beyond a simple wart.
Pain That Affects How You Move
Plantar warts on the bottom of your feet deserve special consideration because of where they sit. Every step presses your full body weight into the wart, and over time that pressure can cause real pain. What often happens next is subtle but important: you start shifting how you stand and walk to avoid the sore spot, often without realizing it. That altered gait can lead to muscle strain or joint discomfort in your ankles, knees, or hips.
If a plantar wart is painful enough that you’re limping, avoiding exercise, or changing your shoes to compensate, that’s a clear signal to get it treated professionally rather than waiting it out. The wart itself may be benign, but the downstream effects on your body aren’t worth tolerating.
Location Matters
Where a wart appears on your body changes the risk calculus significantly. The American Academy of Dermatology recommends seeing a dermatologist for warts on your face or genital area rather than attempting self-treatment. Over-the-counter wart removers contain acids that can damage delicate skin in these areas and leave scarring.
Warts under or around the fingernails and toenails also fall into a higher-concern category. These subungual warts are considered a particularly aggressive variant because they resist standard treatments and can damage the nail matrix, the tissue responsible for nail growth. Left untreated or treated improperly, they can cause permanent nail deformity. Surgical removal is typically recommended for subungual warts, partly because certain strains of the virus that cause them carry an elevated risk of squamous cell carcinoma in that location.
Weakened Immune Systems Change the Equation
If you’re taking immunosuppressive medications (for an organ transplant, autoimmune condition, or cancer treatment), living with HIV, or have any condition that weakens your immune system, warts are a different ballgame. Your body’s ability to fight the underlying virus is compromised, which means warts are more likely to be severe, persistent, and resistant to treatment. They also tend to multiply and recur after clearing.
People with weakened immune systems often need multiple treatment approaches because conventional options simply don’t work as well. A single small wart that would be unremarkable in a healthy person is worth getting evaluated sooner in this population, because early treatment is more effective than waiting for the problem to grow. If you have diabetes or reduced sensation in your feet, plantar warts also deserve faster attention since you may not feel the early pain signals that would otherwise prompt you to act.
The Practical Timeline
For a healthy adult with a single, painless wart on the hand or foot, it’s reasonable to try over-the-counter salicylic acid treatment for several weeks before escalating. Many warts respond to this approach, and some clear on their own without any treatment at all as the immune system eventually catches up to the virus.
But move up your timeline if any of these apply: the wart multiplies into a cluster, it comes back after clearing, it’s in a sensitive location, it changes appearance, it bleeds, it becomes painful, home treatment fails after consistent use, or you aren’t entirely sure the growth is actually a wart. That last point matters more than people realize. If there’s any uncertainty about what you’re looking at, a dermatologist can confirm the diagnosis with a visual exam or, when needed, a small biopsy. The peace of mind alone is worth the visit, and catching something more serious early makes all the difference.