Pathology Epidermolysis bullosa occurs due to alteration is structure of which of the following collagen: A Type 1 collagen. B Type 4 collagen. C Type 6 collagen. D Type 7 collagen. 💡 Explanation Epidermolysis bullosa occurs due to alteration is structure of which of the following collagen: ✓ Correct Answer: D. Type 7 collagen.