Other than pemphigus, Nikolsky's sign is positive in:: (A) Familial benign chronic pemphigus, (B) Hailey- Hailey disease, (C) Epidermolysis bullosa, (D) All of the above
Answer is D. “Nikolsky's sign” is positive in:

Pemphigus.
Familial benign chronic pemphigus (hailey-hailey disease).
Recessive dystrophic epidermolysis bullosa .