From OMIM
Junctional epidermolysis bullosa 5B with pyloric atresia (JEB5B) is an autosomal recessive blistering disease of skin and mucous membranes. Severity of skin involvement ranges from extensive full thickness skin loss (aplasia cutis congenita) to mild epidermolysis bullosa that improves with age. The plane of skin cleavage is through the lamina lucida of the cutaneous basement membrane zone. Pyloric atresia is usually evident within a few days to weeks of life. Atresia may occur at other gastrointestinal sites including the esophagus and duodenum. JEB5B is usually lethal within the first few weeks of life despite surgical correction of pyloric atresia. Milder, non-lethal forms with less skin blistering have been reported (summary by Has et al., 2020). Another form of junctional epidermolysis bullosa with pyloric atresia (JEB6; 619817) is caused by mutations in the integrin-alpha-6 gene (ITGA6; 147556). See also epidermolysis bullosa simplex with pyloric atresia (EBS5C; 612138), which is caused by mutations in the PLEC1 gene (601282). For a discussion of genetic heterogeneity of the subtypes of JEB, see JEB1A (226650). Reviews Has et al. (2020) reviewed the clinical and genetic aspects, genotype-phenotype correlations, disease-modifying factors, and natural history of epidermolysis bullosa. In a study involving 265 cases of junctional or hemidesmosomal EB, Varki et al. (2006) reviewed the clinical and molecular heterogeneity of these subtypes of EB, discussed exceptions to the general rules on genotype-phenotype correlations, and noted unusual phenotypes and genetics observed in patients and families with EB.  http://www.omim.org/entry/226730

From MedlinePlus Genetics
Other complications of EB-PA can include fusion of the skin between the fingers and toes, abnormalities of the fingernails and toenails, joint deformities (contractures) that restrict movement, and hair loss (alopecia). Some affected individuals are also born with malformations of the urinary tract, including the kidneys and bladder.

People with EB-PA are also born with pyloric atresia, which is a blockage (obstruction) of the lower part of the stomach (the pylorus). This obstruction prevents food from emptying out of the stomach into the intestine. Signs of pyloric atresia include vomiting, a swollen (distended) abdomen, and an absence of stool. Pyloric atresia is life-threatening and must be repaired with surgery soon after birth.

Because the signs and symptoms of EB-PA are so severe, many infants with this condition do not survive beyond the first year of life. In those who survive, the condition may improve with time; some affected individuals have little or no blistering later in life. However, many affected individuals who live past infancy experience severe health problems, including blistering and the formation of red, bumpy patches called granulation tissue. Granulation tissue most often forms on the skin around the mouth, nose, fingers, and toes. It can also build up in the airway, leading to difficulty breathing.

Epidermolysis bullosa with pyloric atresia (EB-PA) is a condition that affects the skin and digestive tract. This condition is one of several forms of epidermolysis bullosa, a group of genetic conditions that cause the skin to be fragile and to blister easily. Affected infants are often born with widespread blistering and areas of missing skin. Blisters continue to appear in response to minor injury or friction, such as rubbing or scratching. Most often, blisters occur over the whole body and affect mucous membranes such as the moist lining of the mouth and digestive tract.  https://medlineplus.gov/genetics/condition/epidermolysis-bullosa-with-pyloric-atresia