Acanthosis nigricans is a condition in which tan or brown raised areas appear on the sides of the neck, armpits and groin. Sometimes they also occur on the hands, elbows and knees.
Acanthosis nigricans usually strikes people who are very overweight. The best treatment is to lose weight. Some creams can help the spots look better.
Necrobiosis Lipoidica Diabeticorum
Another disease that may be caused by changes in the blood vessels is necrobiosis lipoidica diabeticorum (NLD). NLD causes spots similar to diabetic dermopathy, but they are fewer, larger, and deeper.
NLD often starts as a dull, red, raised area. After a while, it looks like a shiny scar with a violet border. The blood vessels under the skin may become easier to see. Sometimes NLD is itchy and painful. Sometimes the spots crack open.
NLD is a rare condition. Adult women are the most likely to get it. As long as the sores do not break open, you do not need to have it treated. But if you get open sores, see your doctor for treatment.
Diabetic Blisters (Bullosis Diabeticorum)
Rarely, people with diabetes erupt in blisters. Diabetic blisters can occur on the backs of fingers, hands, toes, feet and sometimes on legs or forearms. These sores look like burn blisters and often occur in people who have diabetic neuropathy. They are sometimes large, but they are painless and have no redness around them. They heal by themselves, usually without scars, in about three weeks. The only treatment is to bring blood sugar levels under control.
Sometimes, people with diabetes develop tight, thick, waxy skin on the backs of their hands. Sometimes skin on the toes and forehead also becomes thick. The finger joints become stiff and can no longer move the way they should. Rarely, knees, ankles, or elbows also get stiff.
This condition happens to about one third of people who have type 1 diabetes. The only treatment is to bring blood sugar levels under control.