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Diabetes can affect many parts of your body, including your skin. When diabetes affects the skin, its often a sign that your blood sugar (glucose) levels are too high. This could mean that:

You have undiagnosed diabetes, or pre-diabetes

Your treatment for diabetes needs to be adjusted

If you notice any of the following warning signs on your skin, its time to talk with your doctor.

This skin condition often begins as small raised solid bumps that look like pimples. As it progresses, these bumps turn into patches of swollen and hard skin. The patches can be yellow, reddish, or brown.

You may also notice:The surrounding skin has a shiny porcelain-like appearance

A dark patch (or band) of velvety skin on the back of your neck, armpit, groin, or elsewhere could mean that you have too much insulin in your blood. This is often a sign of prediabetes.The medical name for this skin condition is acanthosis nigricans.

Often causing darker skin in the creases of the neck, AN may be the first sign that someone has diabetes.

When this develops on the fingers, toes, or both, the medical name for this condition is digital sclerosis.

On the hands, youll notice tight, waxy skin on the backs of your hands. The fingers can become stiff and difficult to move. If diabetes has been poorly controlled for years, it can feel like you have pebbles in your fingertips.

Hard, thick, and swollen-looking skin can spread, appearing on the forearms and upper arms. It can also develop on the upper back, shoulders, and neck. Sometimes, the thickening skin spreads to the face, shoulders, and chest.

In rare cases, the skin over the knees, ankles, or elbows also thickens, making it difficult to straighten your leg, point your foot, or bend your arm. Wherever it appears, the thickened skin often has the texture of an orange peel.

This skin problem usually develops in people who have complications due to diabetes or diabetes that is difficult to treat.

Its rare, but people with diabetes can see blisters suddenly appear on their skin. You may see a large blister, a group of blisters, or both. The blisters tend to form on the hands, feet, legs, or forearms and look like the blisters that appear after a serious burn. Unlike the blisters that develop after a burn, these blisters are not painful.

Large blisters like this one can form on the skin of people who have diabetes.

The medical name for this condition is bullosis diabetricorum. Sometimes, its called diabetic bullae.

People who have diabetes tend to get skin infections. If you have a skin infection, youll notice one or more of the following:Hot, swollen skin that is painful

Has it been a year or longer since your last period, and do you get several yeast infections each year? Its possible that you have diabetes or pre-diabetes.

Having high blood sugar (glucose) for a long time can lead to poor circulation and nerve damage. You may have developed these if youve had uncontrolled (or poorly controlled) diabetes for a long time.

Poor circulation and nerve damage can make it hard for your body to heal wounds. This is especially true on the feet. These open wounds are called diabetic ulcers.

If you have diabetes, you should check your feet every day for sores and open wounds.

This skin condition causes spots (and sometimes lines) that create a barely noticeable depression in the skin. Its common in people who have diabetes. The medical name is diabetic dermopathy. It usually forms on the shins. In rare cases, youll see it on the arms, thighs, trunk, or other areas of the body.

Diabetic dermopathy: This 55-year-old man has had diabetes for many years.

The spots are often brown and cause no symptoms. For these reasons, many people mistake them for age spots. Unlike age spots, these spots and lines usually start to fade after 18 to 24 months. Diabetic dermopathy can also stay on the skin indefinitely.

When these bumps appear, they often look like pimples. Unlike pimples, they soon develop a yellowish color. Youll usually find these bumps on the buttocks, thighs, crooks of the elbows, or backs of the knees. They can form anywhere though.

These bumps appear suddenly and clear promptly when diabetes is well-controlled.

When these bumps appear, they often look like pimples. Unlike pimples, they soon develop a yellowish color. Youll usually find these bumps on the buttocks, thighs, crooks of the elbows, or backs of the knees. They can form anywhere though. No matter where they form, they are usually tender and itchy. The medical name for this skin condition is eruptive xanthomatosis.

Whether this skin condition is associated with diabetes is controversial. We know that most people who have granuloma annulare do not have diabetes. Several studies, however, have found this skin condition in patients who have diabetes. One such study found that people with diabetes were most likely to have granuloma annulare over large areas of skin and that the bumps came and went. Another study concluded that people who have granuloma annulare that comes and goes should be tested for diabetes.

This skin condition causes bumps and patches that may be skin-colored, red, pink, or bluish purple.

If you have diabetes, youre more likely to have dry skin. High blood sugar (glucose) can cause this. If you have a skin infection or poor circulation, these could also contribute to dry, itchy skin.

These develop when you have high fat levels in your blood. It can also be a sign that your diabetes is poorly controlled.The medical name for this condition is xanthelasma.

Many people have skin tagsskin growths that hang from a stalk. While harmless, having numerous skin tags may be a sign that you have too much insulin in your blood or type 2 diabetes.

These growths are most common on the eyelids, neck, armpit, and groin.

Diabetes can cause many other skin problems. Most skin problems are harmless, but even a minor one can become serious in people who have diabetes. A board-certified dermatologist can recognize skin problems due to diabetes and help you manage them.

ImagesImage 1: Image Courtesy of Clark C. Otley, MD. All Rights Reserved

Images 3, 7, 8, 9: Used with permission of the American Academy of Dermatology National Library of Dermatologic Teaching Slides.

Image 2 from DermNetNZ

Some images used with permission of Journal of the American Academy of Dermatology

Images 5, 6 and 10: Getty Images

ReferencesCohen Sabban, EN. Cutaneous manifestations of diabetes mellitus from A to Z. Focus session presented at: 74th Annual Meeting of the American Academy of Dermatology; March 4-8, 2016; Washington D.C.

Duff M, Demidova O, et al. Cutaneous manifestations of diabetes mellitus. Clinical Diabetes. 2015;33:40-8.

Kalus AA, Chien AJ, et al. Diabetes mellitus and other endocrine disorders. In: Wolff K, Goldsmith LA, et al. Fitzpatricks Dermatology in General Medicine (seventh edition). McGraw Hill Medical, New York, 2008:1461-70.

McKinley-Grant L, Warnick M, et al. Cutaneous manifestations of systemic disease. In: Kelly AP and Taylor S. Dermatology for Skin of Color. (first edition). The McGraw-Hill Companies, Inc. China, 2009:481-4.

Morgan AJ and Schwartz RA. Diabetic dermopathy: A subtle sign with grave implications. J Am Acad Dermatol. 2008;58:447-51.

Yosipovitch G, Loh KC, et al. Medical pearl: Scleroderma-like skin changes in patients with diabetes mellitus. J Am Acad Dermatol. 2003;48:109-11.

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Diabetes: 12 warning signs that appear on your skin

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