Diabetes does not directly cause warts, but it creates conditions in the body that make you more susceptible to the virus that does. Warts are caused by human papillomavirus (HPV), and people with diabetes have a harder time fighting off HPV infections due to immune changes triggered by high blood sugar. There’s also a common case of mistaken identity at play: skin tags, which are strongly linked to insulin resistance and type 2 diabetes, are frequently confused with warts.
How Diabetes Increases Your Risk of Warts
Warts develop when HPV infects the outer layer of skin, typically through a small cut or break. Your immune system is supposed to recognize and clear the virus, but persistently high blood sugar interferes with that process in several ways. Elevated glucose impairs the function of key immune cells, including the type of white blood cells (CD8 T cells) responsible for killing virus-infected cells. These cells need to ramp up their energy metabolism to mount an effective attack, and hyperglycemia disrupts that process. On top of that, high blood sugar reduces the production of important signaling molecules that coordinate the immune response.
A large study from China’s largest academic women’s hospital found that women over 50 with diabetes had an 18% higher risk of HPV infection compared to women with normal blood sugar levels. The HPV-positive rate among diabetic patients was 36.7%, compared to 33.1% in non-diabetic patients. Women with prediabetes also showed elevated rates. The researchers noted a higher risk of persistent HPV infection among women with diabetes, meaning the virus was more likely to stick around rather than being cleared by the immune system.
Changes in the tiny blood vessels of the skin also play a role. Diabetes damages the microvasculature, reducing the body’s ability to deliver immune cells to skin lesions. This is the same mechanism behind the slow wound healing and chronic skin infections that many people with diabetes experience. Once HPV takes hold in the skin, a weakened local immune response means the virus can persist longer, giving warts more opportunity to grow and spread.
Skin Tags vs. Warts: A Common Mix-Up
If you have diabetes and notice small growths on your skin, there’s a good chance they’re skin tags rather than warts. Skin tags are soft, flesh-colored flaps of skin that hang from a thin stalk, usually appearing on the neck, armpits, eyelids, or groin. Warts, by contrast, tend to be rough, firm, and slightly raised with a grainy texture. Skin tags are painless and smooth; warts can have tiny black dots (clotted blood vessels) on their surface.
The connection between skin tags and insulin resistance is well established. One study found that the presence of multiple skin tags was strongly associated with insulin resistance regardless of other risk factors like age, weight, or family history of diabetes. People with high insulin resistance levels had 7.5 times the odds of having skin tags compared to those with normal levels. Roughly 60% of patients with type 2 diabetes in one clinical evaluation had skin tags. So if you’ve noticed small growths appearing alongside a diabetes diagnosis, skin tags are a likely explanation.
Why Plantar Warts Are Riskier With Diabetes
Warts on the soles of the feet deserve special attention if you have diabetes. Plantar warts grow inward due to the pressure of standing and walking, and they can become painful or create areas of thickened skin (calluses). For someone with diabetic neuropathy, which reduces sensation in the feet, this creates a dangerous chain of events. You may not feel the wart or the pressure it creates, and repeated trauma to that spot can eventually break down the skin.
Diabetic neuropathy also affects the nerves controlling sweat production in the feet, leading to dry, cracked skin that’s more vulnerable to both HPV entry and secondary infections. Increased glycation (sugar binding to proteins) causes calluses to thicken and press harder against the soft tissue underneath. Without normal sensation to alert you to the problem, a wart or callus can progress to a skin ulcer before you notice it. This is why daily foot checks are standard advice for anyone with diabetes.
Treating Warts When You Have Diabetes
The most common over-the-counter wart treatment, salicylic acid, is explicitly contraindicated for people with diabetes or impaired blood circulation. The FDA labeling on these products states this clearly. Salicylic acid works by dissolving skin layer by layer, and in someone with reduced sensation and poor circulation, it can cause tissue damage, burns, or open wounds that heal slowly or become infected.
Diabetic skin heals differently. Compared to non-diabetic wounds, diabetic wounds spend longer in the inflammatory phase of healing, which delays recovery and increases the risk of a wound becoming chronic. This extended healing timeline makes any treatment that breaks the skin, whether chemical or physical, a higher-stakes decision.
Your best option is to have a dermatologist or podiatrist evaluate the growth. They can confirm whether it’s actually a wart (and not a skin tag or callus), then choose a treatment approach that accounts for your circulation, sensation, and healing capacity. For foot warts especially, professional treatment reduces the risk of complications that could snowball into more serious problems. If you do develop any wound from a wart or its treatment, keeping it clean, covered with a bandage, and monitored daily for signs of worsening is essential.
Blood Sugar Control and Skin Health
Because the immune impairment behind wart susceptibility is driven largely by hyperglycemia, keeping blood sugar well managed is one of the most effective things you can do to protect your skin. Better glucose control improves immune cell function, supports healthier blood vessel walls, and speeds wound healing. It won’t make you immune to HPV, but it gives your body a much better chance of clearing the virus before a wart develops or spreads. People with prediabetes already show increased HPV susceptibility, so the earlier blood sugar is addressed, the better the skin-level protection.