Diabetes’s impact on the skin is relatively less well-known, but it’s actually a very common complication. A significant portion of people with diabetes experience at least one skin-related issue during their lifetime, and sometimes these skin changes can even be the first sign that leads to a diabetes diagnosis.
Why Diabetes Affects the Skin
High blood sugar reduces blood circulation, affects nerve function, and weakens the immune system’s ability to fight infection. When these three factors combine, skin becomes drier, wound healing slows, and vulnerability to bacterial or fungal infections increases. Elevated blood sugar also affects the skin’s collagen structure directly, contributing to various skin changes.
Acanthosis Nigricans: A Sign of Insulin Resistance
Acanthosis nigricans—characterized by dark, velvety, thickened patches of skin in areas like the neck, armpits, and groin—is a classic skin indicator of insulin resistance. Because it often appears before an official diabetes diagnosis, noticing this type of skin change is a good reason to get blood sugar tested.
Bacterial and Fungal Infections
People with diabetes are more vulnerable to bacterial skin infections such as staph infections, folliculitis, and infections around the nails. High blood sugar also creates favorable conditions for fungal growth, with candida infections commonly occurring in warm, moist areas like between the toes, around nails, armpits, and groin. These infections tend to occur more frequently and severely than in the general population.
Diabetic Dermopathy
Small, round, brownish patches appearing on the shins are relatively commonly observed in people with diabetes, a condition called diabetic dermopathy. It’s thought to be related to microvascular damage, and while usually painless and non-itchy, it’s considered a sign of chronic diabetes.
Necrobiosis Lipoidica Diabeticorum
Though relatively rare, necrobiosis lipoidica diabeticorum—characterized by hardened, yellowish lesions on the shins—is also associated with diabetes. The skin in affected areas can become thin and easily damaged, requiring special caution.
Dry, Cracked Skin
Fluid loss from high blood sugar combined with reduced circulation can cause skin to become dry and crack. Cracked skin on the feet in particular can become an entry point for bacteria, raising the risk of infection or ulcers, making this area especially important to monitor.
Delayed Wound Healing
People with diabetes often notice that even minor wounds heal noticeably more slowly. This results from a combination of reduced circulation and weakened immune function. If a wound persists longer than usual or worsens, prompt medical evaluation is important.
Habits for Protecting Skin Health
Managing blood sugar within target range is central to preventing skin complications. Using moisturizer daily helps prevent dryness, with particular attention to keeping the spaces between toes dry to prevent fungal infections. Long, hot showers can further dry out skin and are best avoided. Developing a habit of seeking prompt treatment for minor wounds or signs of infection, rather than letting them go unaddressed, is important.
Final Thoughts
Skin is an organ that visibly reveals the effects of diabetes in relatively observable ways. Paying close attention to minor skin changes can serve as an important signal for checking your overall diabetes management status and preventing more serious complications early.
This article is intended for general health information purposes. If skin abnormalities persist, please consult a healthcare professional.
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