Read this as a sign-to-disease mapping exercise built around epidermal cohesion. Where keratinocytes lose adhesion (acantholysis, as in pemphigus vulgaris), tangential pressure peels the skin and Nikolsky is positive. Where the split is below the epidermis (bullous pemphigoid, a hemidesmosomal/sub-epidermal disease), the overlying epidermis stays cohesive and Nikolsky is negative.
SJS/TEN produces full-thickness epidermal death; pressure over already inflamed skin shears it off, which is described as a pseudo-Nikolsky (Asboe-Hansen) phenomenon rather than the true acantholytic sign.
The single most disease-specific clue, however, is morphologic: pemphigus vegetans - an intertriginous, vegetating variant of pemphigus - produces a tongue with deep furrows and ridges resembling brain convolutions, i.e., the cerebriform tongue. That is the highlighted match.
\[\boxed{\text{Cerebriform tongue} \Rightarrow \text{Pemphigus vegetans}}\]