This lesion in the commissure is most likely caused by Candida albicans or a nutritional deficiency and is called:

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This lesion in the commissure is known as angular cheilitis, which is most commonly caused by Candida albicans or a nutritional deficiency. Pseudomembranous candidiasis presents as white, curd-like plaques on the oral mucosa and tongue. Chronic mucocutaneous candidiasis affects multiple areas of mucosa, skin, and nails. Chronic atrophic candidiasis, also known as denture stomatitis, presents as a red, smooth, and shiny mucosa under a denture.

This Lesion in the Commissure Is Most Likely Caused by Candida