Diabetic Skin Lesions: Rash, Blisters, Dermopathy, & Ulcers

Diabetic Skin Lesions

Diabetic Skin Lesions can range from a rash that may not be even noticed by the patient to severe blistering skin disease that may be life-threatening.

Often, these rashes get infected and may change their appearance from vesicular (clear fluid-filled blister) to pustular (pus-filled blisters) to an abscess (pocket of pus).

Diabetic dermopathy is a condition that primarily affects people with long-standing diabetes. It occurs as a result of neurovascular disease, infections, and accumulation of glycated end-products.

Diabetic Cheiroarthropathy is a tightening of the solar and palmar aspects of the skin. Diabetic Dermopathy and Diabetic Cheiroarthropathy are two conditions that are exclusively found in patients with long-standing diabetes.

Other conditions discussed here may be associated with diabetes but are not exclusively found in patients with diabetes.


Introduction to Diabetic Skin Lesions:

The incidence of diabetes is quite high, in fact in America 1 in every 10 people had diabetes, and around about 90 to 95% of them have type 2 diabetes mellitus. [Ref]

Diabetes is associated with multiple complications. Diabetic skin lesions are commonly reported compared to other organ involvement because of obvious reasons.

Skin lesions are easily seen by the patient and therefore reported earlier. On the other hand, kidney diseases and heart diseases in diabetics are usually missed or picked up at a very late stage.

Types of Diabetes

A set of known types of diabetes is briefly described below.

Prediabetes is a condition in which the blood sugar level is above normal but below the diagnosis of diabetes and includes symptoms like cold feet and hands, blurry vision, etc.

Type 1 diabetes is an autoimmune condition in which the body’s own immune system malfunctions and mistakes its own cells as foreign pathogens and destroys them. These cells called beta cells, perform the task of making insulin.

Type 2 diabetes involves the inability of your body to use insulin properly and it is largely a diet-related issue that develops later in life usually.

Gestational diabetes refers to diabetes during pregnancy. This typically develops during the second trimester in overweight women and affects fetal growth.

Other less common types of diabetes include:


Diabetic Skin Lesions

Due to the way diabetes impairs the immune system, a person becomes susceptible to a number of diseases including some major skin diseases which are given here.

Diabetes Rash:

The chances of a diabetic developing dry or itchy skin are pretty high. The reasons behind this rash can be poor blood circulation and dehydration.

People with diabetes are usually feeling excessive thirst because their kidneys are working overtime to remove the extra glucose from their bloodstream.

In case of diabetes rash, the skin has small bumps which are like pimples, and with time this turns into swollen skin patches that can be painful to touch.

Such swollen patches are yellowish, brownish, or reddish.


Diabetic Dermopathy

Necrobiosis Lipoidica diabeticorum diabetic skin lesions
Necrobiosis lipoidica Diabeticorum [Source]
This skin condition is the most common one among diabetics. It affects almost 50% of diabetics. In this condition, pigmented patches are present on the lower legs, also known as shin spots.

This can be due to the alterations in the small blood vessels present in the legs which leads to some leakage of blood material into the skin area.

Such spots can occur in the forearm, legs, thighs, or lateral and medial sides of feet. These patches are round or oval-shaped and scaly in appearance.

This condition does not call for any sort of medical treatment apart from having good control over your blood sugar level. Nevertheless, keeping it moisturized can help.


Diabetic Cheiroarthropathy:

dupuytrens contracture diabetic hand
Dupuytren’s contracture

Diabetic Cheiroarthropathy is one of the diabetic skin lesions that often go unnoticed. It is characterized by tightening of the skin of palms and soles.

Patients develop a thickened, tight, waxy, stiff, and yellowish discoloration of the skin. It may affect the overlying joints and result in restriction of movements around the joint.

Some patients may develop localized diabetic cheiroarthropathy over the palmar surface that may manifest as Dupuytren’s contracture.

It is believed to occur as a result of glucose and protein interactions in the skin and the accumulation of glycated end-products.


Diabetic Foot Ulcer

Patients with diabetes who use insulin are at a greater risk of developing a foot ulcer as well as diabetics who suffer from any sort of kidney, heart, or eye disease.

Weight can play a good role in the progression and development of a foot ulcer as it is more common among overweight diabetics.

diabetic bullous eruptions diabetic skin lesions
diabetic bullous eruption and ulcers [Source]
Owing to some trauma to the skin, numbness in the foot region, irritation, poor blood circulation, foot deformities, or poorly controlled blood sugar level an ulcer can form at the bottom of the foot.

Treatment includes preventing the incidence of any infection, removing the dead skin around the ulcer, and most importantly managing the blood sugar level.


Cellulitis and Skin Infections:

Skin infections are very common in patients with diabetes. It is especially common in patients with uncontrolled diabetes and those with concomitant neuropathy and vasculopathy.

Diabetic neuropathy causes the loss of skin sensations and patients who develop skin ulcerations only notice them when the disease is quite advanced.

Similarly, diabetic patients with peripheral arterial disease have impaired blood supply. This causes poor wound healing. When an ulcer develops, the lesion takes more time to heal than in patients without vascular disease.

Cellulitis of the lower limbs is one of the most common diabetes-related complications. It manifests as redness, swelling, pain, raised temperature, and tightening of the skin.

The disease may be missed in the early phase and may be mistaken as deep vein thrombosis in the later stages. Sometimes, patients develop DVT in addition to cellulitis.

Cellulitis is treated by using appropriate antibiotics, pain medicines, limb elevation, and controlling diabetes.


 Acanthosis Nigricans

acanthosis nigricans
Acanthosis nigricans [Source]
Mainly caused by elevated levels of insulin present in the case of insulin resistance which is typically found in obese and overweight individuals.

Appearance-wise, the patient has dark-pigmented skin patches that look velvety in texture.

Mostly, the skin around the neck, armpits, and groin area are affected but areas like knuckles, knees, and elbows can also be affected.

It can be treated by managing the underlying cause like diabetes or losing weight.

Metformin should be part of the treatment regimen in patients with diabetes. Newer therapies like Semaglutide (Ozempic and Rybelsus) may be tried as well.



Loss of skin pigment in random regions on the surface of the skin is vitiligo. The melanin-producing cells called melanocytes are lost and this results in discolored patches.

Vitiligo is more common among type 1 diabetics than type 2 diabetics. However, its incidence is increasing among type 2 diabetics.

The association between both type 1 and type 2 diabetes and vitiligo has been confirmed by a study. [Ref]

A 2017 study examined vitiligo among people with type 2 diabetes. It included over 600 individuals with type 2 diabetes in a study group and it was concluded that vitiligo can develop in type 2 diabetes. [Ref]


Lichen Planus

A typical disorder that induces inflammation on the skin where it is itchy or inside the mouth where it is burning or sore. It appears as purplish flat bumps on the skin.

It can occur due to some medicines that are used to treat diabetes. There is not much you can do to prevent but it can be managed by avoiding any injury and scratching the area.

A study that evaluated the risk of oral lichen planus in diabetes mellitus found that there was a strong association between the two. [Ref]


Eruptive Xanthomatosis

eruptive xanthomas in diabetics diabetic skin lesions
Eruptive Xanthomas in Diabetics [Source]
Commonly occurs in people who have an elevated blood lipid or fat profile and poorly controlled diabetes. Small bumps that are yellowish-red in color appear on the skin.

Diabetics do not have proper insulin functioning in their body which leads to the accumulation of fat as it cannot be broken down. This leads to eruptive xanthomatosis.

According to a study, eruptive xanthomatosis can be an initial and early sign of hypertriglyceridemia and poorly controlled diabetes mellitus. [Ref]



Xanthelasma is common in diabetic skin lesions
Xanthelasma is common in diabetics [Source]
Xanthelasma is the deposition of cholesterol over or around the eyelids. It is commonly found in diabetics who are obese and have concomitant metabolic syndrome.

People with xanthelasma usually have raised blood cholesterol levels and are at risk of developing cardiovascular diseases.

Lipid-lowering medicines usually do not help in the resolution of these lesions. Cosmetic laser therapies or electric cautery might cure these lesions. However, recurrence is common.



severe impetigo and herpes simplex infection in a diabetic skin lesions
Impetigo [Source]
Impetigo is the yellow-crusted lesions around the angle of the mouth. It is more common in children with or without diabetes.

It commonly follows after cold sores (herpes simplex infection) when the lesions get infected. It is not a manifestation of diabetes but is common in patients with diabetes.

Treatment includes topical or oral antibiotics that cover gram-positive organisms, keeping the area clean, and controlling blood sugars.


Athletes foot:

Fungal infection between toes in diabetics
Fungal infection between toes in diabetics [Source]
An athlete’s foot or Tinea Pedis is a fungal infection of the skin between the toes. It affects people who sweat a lot, those who wear shoes for a longer time (especially with wet socks), and immunocompromised individuals.

Since diabetics are immunocompromised, they are more prone to develop athlete’s foot and other fungal infections.

Apart from interdigital fungal infections, diabetic patients also develop candida infections in their groin and armpits.

Treatment of athletes’ foot infections is focused on maintaining hygiene, keeping the areas dried, controlling blood sugars, and using oral or topical antifungal drugs.



Diabetic skin diseases have variable manifestations. These may range from mild to severe skin involvement.

Diabetic skin lesions develop as a result of multiple factors including uncontrolled diabetes, vasculopathy, neuropathy, infections, and immune-mediated.

What do you think?

Written by Dr. Ahmed

I am Dr. Ahmed (MBBS; FCPS Medicine), an Internist and a practicing physician. I am in the medical field for over fifteen years working in one of the busiest hospitals and writing medical posts for over 5 years.

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