Pathology Given Condition is due to a defect in the normal keratinization of the oral mucosa: A White sponge Nevus. B Erythema multiformae. C Incontinentia pigmenti. D Systemic sclerosis. 💡 Explanation Given Condition is due to a defect in the normal keratinization of the oral mucosa: ✓ Correct Answer: A. White sponge Nevus.