10 Changes in Your Skin That Could Signal Blood Sugar Issues

Your skin is a remarkable organ, and it can often provide clues about your overall health. Changes in your skin’s appearance or texture can sometimes be the first indication of an underlying medical condition, including issues with your blood sugar levels. High blood sugar, a hallmark of prediabetes and diabetes, can affect your body in numerous ways, and your skin is no exception. This article will explore ten common skin changes that could signal a problem with your blood sugar, drawing on information from reputable sources such as the American Academy of Dermatology (AAD), the Centers for Disease Control and Prevention (CDC), and the National Center for Biotechnology Information (NCBI).

1. Dark, Velvety Patches of Skin (Acanthosis Nigricans)

One of the most well-known skin signs of high blood sugar is acanthosis nigricans (AN). This condition causes dark, thickened, and velvety patches of skin, typically in the folds and creases of your body, such as the neck, armpits, and groin [1]. AN is a strong indicator of insulin resistance, a condition where your body’s cells don’t respond effectively to insulin. Insulin resistance is a precursor to type 2 diabetes, and the presence of AN should prompt a discussion with your doctor about getting tested for diabetes [2].

2. Brown, Scaly Patches (Diabetic Dermopathy)

Often referred to as “shin spots,” diabetic dermopathy appears as light brown or reddish, round or oval, scaly patches, most commonly on the shins [3]. These spots are caused by changes in the small blood vessels that supply the skin, a common complication of diabetes. While harmless and not typically painful or itchy, the presence of four or more of these lesions is strongly associated with diabetes [4].

3. Yellow, Reddish, or Brown Patches (Necrobiosis Lipoidica)

Necrobiosis lipoidica is a rarer skin condition that begins as small, raised, red bumps that can progress to larger patches of swollen, hard skin with a yellowish, reddish, or brown hue [1]. The center of the patch may become thin and waxy, and the blood vessels underneath may be visible. This condition can be itchy and painful, and while the exact cause is unknown, it is strongly associated with diabetes [5].

4. Blisters (Bullosis Diabeticorum)

Also known as diabetic blisters, bullosis diabeticorum is a condition where blisters suddenly appear on the skin, often on the hands, feet, legs, or forearms. These blisters can be large and look like burn blisters, but they are usually painless and heal on their own without scarring [2]. The exact cause is not fully understood, but they are more common in people with diabetic neuropathy and poorly controlled blood sugar levels [6].

5. Small, Reddish-Yellow Bumps (Eruptive Xanthomatosis)

Eruptive xanthomatosis is a condition that causes firm, pea-like enlargements in the skin with a red halo around them. These bumps are often found on the backs of hands, feet, arms, and legs, and they can be tender and itchy [1]. This condition is a sign of very high levels of cholesterol and triglycerides in the blood, which can be associated with uncontrolled diabetes [2].

6. Tight, Thick, Waxy Skin (Digital Sclerosis)

Digital sclerosis is a condition that causes the skin on the fingers, toes, and hands to become thick, tight, and waxy. This can lead to stiffness in the joints, making it difficult to move the fingers [2]. If blood sugar levels remain high, this condition can spread to other areas of the body. Digital sclerosis is more common in people with type 1 diabetes [5].

7. Increased Skin Infections

High blood sugar levels can weaken the immune system, making people with diabetes more susceptible to both bacterial and fungal skin infections [2]. Bacterial infections can cause hot, swollen, and painful areas on the skin, while fungal infections, such as athlete’s foot, jock itch, and ringworm, can cause itchy rashes. Frequent infections can be a sign of undiagnosed or poorly controlled diabetes [5].

8. Dry, Itchy Skin (Pruritus and Xerosis)

While dry, itchy skin is a common complaint, it can be particularly problematic for people with diabetes. High blood sugar can cause the body to lose fluids at a faster rate, leading to dehydration and dry skin (xerosis) [2]. Poor circulation and nerve damage, both potential complications of diabetes, can also contribute to dry, itchy skin (pruritus) [5].

9. Slow-Healing Sores and Wounds

High blood sugar levels can damage nerves and impair circulation, which can make it difficult for the body to heal wounds, especially on the feet [1]. Even minor cuts and sores can become serious infections if they are not noticed and treated promptly. Slow-healing wounds are a serious complication of diabetes and require immediate medical attention [5].

10. Skin Tags

Skin tags are small, benign growths of skin that are common in the general population. However, having numerous skin tags has been associated with insulin resistance and an increased risk of type 2 diabetes [4]. While the exact connection is not fully understood, the presence of multiple skin tags may be a clue to have your blood sugar levels checked.

Conclusion

Your skin can be a valuable indicator of your overall health, and changes in its appearance should not be ignored. If you notice any of the skin changes described in this article, it is important to consult with a healthcare professional. Early detection and management of blood sugar issues can help prevent serious complications and improve your long-term health.

References

[1] American Academy of Dermatology. (n.d.). Diabetes: 10 warning signs that can appear on your skin. Retrieved from https://www.aad.org/public/diseases/a-z/diabetes-warning-signs

[2] Centers for Disease Control and Prevention. (2024, May 15). Diabetes and Your Skin. Retrieved from https://www.cdc.gov/diabetes/signs-symptoms/diabetes-and-your-skin.html

[3] DermNet NZ. (n.d.). Skin problems associated with diabetes mellitus. Retrieved from https://dermnetnz.org/topics/skin-problems-associated-with-diabetes-mellitus

[4] Tamega, A. A., Aranha, A. M. F., Guiotoku, M. M., Miot, L. D. B., & Miot, H. A. (2010). Association between skin tags and insulin resistance. Anais Brasileiros de Dermatologia, 85(1), 25–31. https://doi.org/10.1590/s0365-05962010000100003

[5] Edwards, E., & Yosipovitch, G. (2025, March 21). Skin Manifestations of Diabetes Mellitus. In Endotext. MDText.com, Inc. Retrieved from https://www.ncbi.nlm.nih.gov/books/NBK481900/

[6] David, P., Singh, S., & Ankar, R. (2023). A Comprehensive Overview of Skin Complications in Diabetes and Their Prevention. Cureus, 15(5), e38961. https://doi.org/10.7759/cureus.38961