Eczema in this area would not typically show the classic sparing of the vermilion border that is characteristic of perioral dermatitis.
Impetigo is a bacterial infection characterized by honey-colored crusts, not the fine papules and pustules of perioral dermatitis.
This is an itchy eruption that appears acutely after sun exposure, a different history and morphology.
Psoriasis would present as well-demarcated, scaly plaques, not as discrete micropapules and pustules.
This is the most difficult differential; perioral dermatitis is distinguished by its predominant perioral location with vermilion sparing and its smaller papules, whereas rosacea is more central facial and associated with flushing.
Papular sarcoidosis consists of reddish-brown papules that do not typically cluster around the mouth in this specific pattern.
Shingles in this area would be unilateral and follow a dermatome, and would be preceded by pain and evolve into vesicles.
This fungal infection presents as an annular, scaly plaque with a raised border, not as micropapules.
