Nicolsky’s sign is seen in: (A) Pemphigus, (B) Chronic desquamative gingivitis, (C) Haily Haily disease, (D) All of the above
Answer is D. Nicolsky's sign
If non ulcerated gingiva are massaged, epithelium readily strips from connective tissue to tive surface, which bleeds readily. Seen in

Pemphigus
Chronic desquamative gingivitis
Haily-Haily disease
Epidermolysis bullosa