Epidermolysis bullosa

Overview

Epidermolysis bullosa (ep-ih-dur-MOL-uh-sis buhl-LOE-sah) is a rare condition that causes fragile, blistering skin. The blisters may appear in response to minor injury, even from heat, rubbing or scratching. In severe cases, the blisters may occur inside the body, such as the lining of the mouth or stomach.

Epidermolysis bullosa is inherited, and it usually shows up in infants or young children. Some people don't develop symptoms until they're teens or young adults.

Epidermolysis bullosa has no cure, but mild forms may improve with age. Treatment focuses on caring for blisters and preventing new ones.

Symptoms

Epidermolysis bullosa symptoms include:

• Fragile skin that blisters easily, especially on the palms and feet
• Nails that are thick or unformed
• Blisters inside the mouth and throat
• Scalp blistering and hair loss (scarring alopecia)
• Skin that looks thin
• Tiny pimple-like bumps (milia)
• Dental problems, such as tooth decay
• Difficulty swallowing
• Itchy, painful skin

Usually epidermolysis bullosa blisters are noticed during infancy. But it's not uncommon for them to appear when a toddler first begins to walk or when an older child begins new activities that cause more friction on the soles of the feet.

When to see a doctor

Contact your health care provider if you or your child develops blisters for an unknown reason. For infants, severe blistering can be life-threatening.

Seek immediate medical care if you or your child:

• Has problems swallowing
• Has problems breathing
• Shows signs of infection, such as warm, painful or swollen skin, pus, or an odor from a sore, and fever or chills

Causes

Epidermolysis bullosa is caused by an inherited gene. You may inherit the disease gene from one parent who has the disease (autosomal dominant inheritance) or from both parents (autosomal recessive inheritance).

The skin is made up of an outer layer (epidermis) and an underlying layer (dermis). The area where the layers meet is called the basement membrane. The types of epidermolysis bullosa are mainly defined by which layers separate and form blisters. The skin injury might be brought on by a minor injury, bump or nothing at all.

The main types of epidermolysis bullosa are:

• Epidermolysis bullosa simplex. This is the most common type. It's brought on by heat and friction and develops in the outer layer of skin. It mainly affects the palms and feet. The blisters heal without scarring.
• Junctional epidermolysis bullosa. This type may be severe, with blisters beginning in infancy. A baby with this condition may develop a hoarse-sounding cry from continual blistering and scarring of the vocal cords.
• Dystrophic epidermolysis bullosa. This type is related to a flaw in the gene that helps produce a protein that glues the skin layers together. If this protein is missing or doesn't function, the layers of the skin won't join properly. It can cause skin that looks thin. Diseased mucous membranes can cause constipation and make it hard to eat.
• Kindler syndrome. This type tends to cause blisters in multiple layers and so can look very different from person to person. The blisters tend to show up in infancy or early childhood. It increases sun sensitivity and causes skin to look thin, mottled and wrinkly.

Epidermolysis bullosa acquisita is distinct from these conditions, as it isn't inherited and it's rare in children.

Risk factors

The major risk factor for developing epidermolysis bullosa is having a family history of the disorder.

Complications

Epidermolysis bullosa can worsen even with treatment, so it's important to spot signs of complications early. Complications may include:

• Infection. Blistering skin can become infected by bacteria.
• Bloodstream infection. Sepsis occurs when bacteria from an infection enter the bloodstream and spread throughout the body. Sepsis can spread rapidly and lead to shock and organ failure.
• Fusion of fingers and changes in the joints. Severe forms of epidermolysis bullosa can bind together fingers or toes and cause unusual bending of the joints (contractures). This can affect the function of the fingers, knees and elbows.
• Problems with nutrition. Blisters in the mouth can make eating difficult and lead to malnutrition and anemia, such as low iron levels in the blood. Problems with nutrition can also cause delayed wound healing and slowed growth in children.
• Constipation. Difficulty passing stool may be due to painful blisters in the anal area. It can also be caused by not ingesting enough liquids or high-fiber foods, such as fruits and vegetables.
• Dental problems. Tooth decay and problems with tissues inside the mouth are common with some types of epidermolysis bullosa.
• Skin cancer. Teenagers and adults with certain types of epidermolysis bullosa are at increased risk of a type of skin cancer called squamous cell carcinoma.
• Death. Infants with severe junctional epidermolysis bullosa are at high risk of infections and loss of body fluids from widespread blistering. Blisters in the mouth and throat also make it harder to eat and breathe. Many of these infants don't survive.

Prevention

It's not possible to prevent epidermolysis bullosa. But these steps may help prevent blisters and infection.

• Handle your child gently. Your infant or child needs cuddling, but be very gentle. To pick up a child with epidermolysis bullosa, place the child on soft material and give support under the buttocks and behind the neck. Don't lift the child from under the arms.
• Take special care with the diaper area. If your child wears diapers, remove the elastic bands and avoid cleansing wipes. Line the diaper with a nonstick dressing or spread it with a thick layer of zinc oxide paste.
• Keep the home environment cool. Try to keep your home cool and the temperature steady.
• Keep the skin moist. Gently apply moisturizer as needed throughout the day.
• Dress your child in soft clothes. Use soft clothing that's simple to get on and off. It may help to remove labels and put on clothing seam-side out to reduce scratching. Try sewing foam pads into the lining of clothing by elbows, knees and other pressure points. Use soft special shoes, if possible.
• Prevent scratching. Trim your child's fingernails regularly.
• Encourage your child to be active. As your child grows, encourage activities that reduce the risk of skin injury. Swimming is a good option. For children with mild forms of epidermolysis bullosa, they can protect the skin by wearing long pants and sleeves for outdoor activities.
• Cover hard surfaces. Consider padding a car seat or bathing tub with sheepskin, foam or a thick towel. Soft cotton or silk can be used as a top layer over the padding.