What is epidermolysis bullosa? Please explain which layer of the skin anatomy is not functioning correctly and why.

Epidermolysis bullosa (EB) is a genetic disease of connective tissue that causes blisters on skin
and mucosal membrane. It is caused due to mutation in keratin or collagen gene. It is a result of
a defect in fixing between the epidermis and dermis, which results in skin fragility and friction....