Which condition is characterized by a mask-like facial appearance, reduced mouth opening, and stiffening of the mucous membranes?

Explanation

Progressive systemic sclerosis typically presents with a mask-like face due to skin tightening, limited oral aperture, and mucosal rigidity. This distinguishes it from conditions like tetanus, multiple sclerosis, and osteomalacia, which do not exhibit these specific facial and mucosal changes.