Autoimmune Rashes: Causes, Treatments, Pictures, and More

The skin is the largest organ in your body, and it can tell you a lot about your health. In fact, your skin is an important part of your immune system. Many autoimmune conditions can affect your skin and cause rashes. In fact, these skin changes may be the first — or only — symptom. 

Let’s take a closer look at autoimmune rashes (with pictures), what causes them, and the best treatment options. 

What causes an autoimmune rash?

With an autoimmune condition, your immune system mistakenly attacks normal parts of your body. And your skin can be a target for that attack. Some autoimmune conditions, like alopecia areata, only affect your skin. Others, like rheumatoid arthritis, can affect your skin as part of a multisystem disorder. A multisystem disorder is one that affects many parts of the body. 

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Because your skin is so visible, a rash may be the first sign of an underlying autoimmune disorder.

What does an autoimmune rash look like?

There’s no single autoimmune rash. Different autoimmune conditions cause different skin changes and symptoms.

Some symptoms are common, like itchy skin or changes in skin color. Other symptoms may be more specific to the underlying condition. 

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Here are some images of common autoimmune rashes.

1. Pink, red, violet, or brown rashes

On darker skin, rashes can look more violet or brown. On lighter skin, they tend to be pink or red. 

2. Scaly patches

These can be white or gray and range from patchy to pretty thick.

3. Open sores

Sores can happen on your skin, but they’re also common inside your mouth or on your genitals.

4. Blisters

Blisters can be small or large. Depending on the cause, they can be firm to the touch or break easily.

5. Crusty skin

Crusty patches often appear alongside rashes, blisters, or open sores.

To get the right diagnosis, you may need to see a dermatologist or healthcare professional with skin expertise. This may require a skin biopsy — an in-office procedure that removes a small piece of tissue for analysis. 

Below, we’ll discuss common skin changes seen in certain autoimmune diseases.

Autoimmune rashes on the face

Two autoimmune diseases — lupus and dermatomyositis — cause rashes that can affect the face in different ways. 

Lupus

Lupus is a chronic autoimmune disease that most commonly affects women ages 15 to 44. There are a few different types of lupus. In addition to the skin, systemic lupus affects many organs and structures, like your: 

• Kidneys

• Joints

• Heart

• Blood vessels 

The first sign of systemic lupus is a butterfly rash on your face. This pink-red or violet-brown rash gets its name from its butterfly shape across the cheeks and bridge of your nose. In some people, it can itch or hurt, and it’s often mistaken for sunburn.

Cutaneous lupus is another form of lupus that mainly affects your skin. It has two main types of rash: 

• Subacute cutaneous lupus: This causes round, scaly patches on skin that’s exposed to the sun. These patches can be red, violet, or brown.

• Discoid lupus: This causes thick, discolored, and scaly patches on your face, scalp, or ears. These patches may be associated with hair loss and be brown, pink, or white.

If you have lupus that affects your skin, your care team may order more tests, like blood work. This is to make sure you don’t have systemic lupus. 

Dermatomyositis

Dermatomyositis is a rare autoimmune disease that causes muscle weakness and skin changes. It can sometimes cause difficulty breathing or a cough. It usually affects children between the ages of 5 and 15 and adults between the ages of 40 and 60.

One early sign of dermatomyositis is a heliotrope face rash. This is a reddish-purple to brown-violet rash on your eyelids. 

Dermatomyositis can also cause skin changes on other parts of your body, including:

• Red, pink, or purple bumps on the outer joints of your hand, knees, or elbows

• Red, violet, brown, or discolored skin on your chest, shoulders, neck, and upper back (sun-exposed areas) 

There’s no cure for lupus or dermatomyositis. But different medications that lower your immune response can help manage symptoms.

Blisters in the skin

Many autoimmune diseases cause skin blisters. Blisters can look different depending on what part of your skin is involved. Some blisters are large, firm, and full of fluid. Others can be small and form yellow crusts. It depends on the underlying autoimmune condition. 

Dermatitis herpetiformis

Dermatitis herpetiformis is a chronic autoimmune skin condition linked to celiac disease. It occurs as a reaction to eating gluten, a protein in many foods like wheat and rye. 

Between 10% and 15% of people with celiac disease get a dermatitis herpetiformis skin rash. This rash usually begins between the ages of 30 and 40 and appears as extremely itchy blisters, along with red to violet bumps and sores. It’s most commonly found on the: 

• Elbows

• Knees

• Buttocks

• Scalp

Many people also experience: 

• Stomach pain

• Cramping

• Diarrhea

• Constipation

For some, symptoms come and go, making it harder to diagnose.

Treatment includes removing all gluten from your diet. Some medications can also help. (More about treatments below.)

Pemphigoid

Pemphigoid is a group of rare autoimmune diseases that form blisters in your skin. The most common type is called bullous pemphigoid. It usually affects people over the age of 70. 

Bullous pemphigoid causes itchy, firm blisters on any part of your skin, including your mouth and genitals. Some people will have just a few spots, while it can cover large parts of the body in others. 

Neurologic diseases — like dementia and Parkinson’s disease — are more common in people with bullous pemphigoid.

There are different medications that can help treat pemphigoid. For many people, the rash will go away on its own after a few years.

Pemphigus

Pemphigus is another group of rare autoimmune diseases that form blisters in the skin. But it’s quite different from pemphigoid. Pemphigus vulgaris is the most common type, and it usually affects middle-age and older adults.

Most people get small blisters that are red, violet, or brown. These blisters break easily but don’t itch. This causes painful ulcers and sores that can join together. Often, the blisters start in the mouth and then spread to other parts of the skin. Some people will have only a few blisters. Others will have large areas of their skin involved. 

In people with darker skin, pemphigus can leave light or dark patches (post-inflammatory hypo and hyperpigmentation) that can take months to fade.

People with pemphigus may also get skin infections where there are blisters. In some cases, pemphigus vulgaris can become life-threatening if it’s not treated.

While there’s no cure for pemphigus, there are good treatments that can control symptoms.

Thick or hardened skin

Some autoimmune rashes, like psoriasis and scleroderma, can cause a change in your skin’s thickness or texture. In some situations, they can also affect other parts of your body.

Psoriasis

Psoriasis is a common autoimmune disease that affects about 3% of adults in the U.S. It’s a chronic condition that causes patches of skin to grow too quickly. 

There are different types of psoriasis, but plaque psoriasis is the most common. In lighter skin tones, this causes red patches with thick, white scales. In darker skin tones, the patches can be violet or brown with gray scales. These patches usually affect the: 

• Elbows

• Knees

• Lower back

• Scalp

Beyond the skin, people with psoriasis can also have other conditions, like:

• Psoriatic arthritis, which causes painful, swollen joints

• Heart disease

• Diabetes

• Depression

Psoriasis is usually a lifelong condition, and treatment depends on how severe your symptoms are. Treatment usually includes medicated creams, pills, or shots that can help lower your immune system. 

Scleroderma

Scleroderma is an autoimmune disease that causes your body to make too much collagen. Collagen is a protein found in your skin and other tissues. While anyone can get scleroderma, it usually affects women between the ages of 30 and 50. 

There are two main types:

• Localized scleroderma (morphea) affects your skin and underlying tissue.

• Systemic scleroderma (systemic sclerosis) can affect your skin and other organs, like your heart, lungs, kidneys, and blood vessels. This is the more serious type.

Both types of scleroderma cause patches of hardened, thick skin that feels firm to the touch and can appear shiny. The patches are usually darker than normal skin, ranging from red to brown. They can also be lighter or white in color. They can be round or oval or form lines along your arms, legs, or forehead.

There’s no cure for scleroderma, but treatments can help manage the different symptoms. Some people with localized scleroderma might not need treatment, as skin changes may go away on their own.

Sores in the mouth or genitals

Mouth ulcers, like canker sores, are common and usually go away on their own. If mouth ulcers keep coming back, or if you also have them on the genitals, they could be a sign of a rare autoimmune disorder called Behçet disease.

Behçet disease can happen at any age, but it usually affects people in their 20s and 30s. Experts don’t know the exact cause, but many symptoms result from inflammation of blood vessels. The condition can be different from person to person, and symptoms often come and go. Some other symptoms include:

• Skin rashes (acne-like spots, blisters, or painful, firm bumps)

• Eye problems (like blurred vision, pain, or sensitivity to light)

• Joint pain

• Diarrhea

• Headaches

There’s no cure for Behçet disease, but symptoms can usually be managed with different medications. In some people, symptoms go away for a period of time (remission), and treatment may not be needed for a while.

Keep in mind that other autoimmune diseases, including lupus and pemphigus, can also cause sores in the mouth or genitals. If you have these symptoms, it’s a good idea to visit your primary care provider or dermatologist so they can help find the underlying cause.

Treating autoimmune skin rashes

The most important part of treating autoimmune rashes is treating the underlying condition. Most medications work by lowering inflammation and suppressing your immune response. When only small areas of skin are affected, medicated creams or lotions may be enough. Pills or shots are more common when larger areas of skin or other organs are involved.

Here are some common medications used to treat autoimmune diseases:

• Corticosteroids help block inflammation and can be used to treat most autoimmune diseases. They come as medicated creams, injections, or pills.

• Methotrexate (Rheumatrex) is a pill that helps to lower your immune system. It’s used to treat many autoimmune diseases, including lupus, dermatomyositis, psoriasis, pemphigus, and pemphigoid.

• Hydroxychloroquine (Plaquenil) is a pill that’s usually used to treat malaria, but it also works well for lupus.

• Dapsone (Aczone) is a pill that’s usually used to treat certain infections but is also effective for dermatitis herpetiformis.

• Biologics are newer medications that block specific molecules in your immune system. Most are given as shots. Etanercept (Enbrel) treats psoriasis or psoriatic arthritis. Rituximab (Rituxan) treats pemphigus vulgaris. Belimumab (Benlysta) treats systemic lupus.

Do any over-the-counter treatments work? 

It depends. Some over-the-counter (OTC) products can help, but they may not be strong enough to use as the first treatment. In certain situations, products with these ingredients may help:

• Hydrocortisone is a low-strength steroid cream that may help with mild rashes that occur in autoimmune disease.

• Salicylic acid, urea, or coal tar can help treat psoriasis.

• Calamine or menthol can help soothe some itchy rashes.

Sun protection if you have an autoimmune condition

Sun protection is an important part of treatment for many autoimmune rashes, especially those caused by lupus and dermatomyositis. Even small amounts of sun exposure can worsen skin symptoms. So, wearing sunscreen with at least SPF 30 every day is important.

Psoriasis is one autoimmune condition where ultraviolet (UV) light is used as a treatment (phototherapy). While natural sunlight may help with symptoms, it’s not always recommended. 

Talk with your primary care provider or dermatologist about what’s right for you if you have psoriasis. Keep in mind that some medications used to treat autoimmune diseases can also make you more sensitive to the sun.

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Written by:

Maria Robinson, MD, MBA

Maria Robinson, MD, MBA, is a board-certified dermatologist and dermatopathologist who has practiced dermatology and dermatopathology for over 10 years across private practice, academic, and telehealth settings. She is a fellow of the American Academy of Dermatology and the American Society of Dermatopathology.

Edited by:

Karla Robinson, MD

Karla Robinson, MD, is a medical editor for GoodRx. She is a licensed, board-certified family physician with almost 20 years of experience in health through varied clinical, administrative, and educational roles.

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Images used with permission from VisualDx (www.visualdx.com).