Erythematous palatal mucosa conforming to denture outline — denture stomatitis.

Denture stomatitis (chronic atrophic candidiasis, Newton's type I–III) is caused by overgrowth of Candida albicans underneath a poorly-fitting or continuously worn denture. Warm, moist, unhygienic conditions favour fungal biofilm. Treatment includes denture hygiene, nystatin/clotrimazole, tissue rest, and eventual reline or remake.