In a man presenting with erythematous, papular lesions on the forehead and chin, what is the most likely diagnosis?

The most likely diagnosis in this case, considering the presentation of erythematous, papular lesions on the forehead and chin, is acne rosacea. This condition typically manifests as redness and visible blood vessels in the face, often accompanied by small, red, pus-filled bumps, commonly affecting the central part of the face. The distribution of the lesions on the forehead and chin aligns well with the typical sites of involvement in acne rosacea, particularly in adults.

Acne rosacea is also characterized by episodes of flushing or blushing and can sometimes lead to the development of a thickened skin texture over time, particularly on the nose. The lesions may not necessarily be itchy, which distinguishes them from some other skin conditions.

In summary, the erythematous, papular lesions described in the case strongly correlate with the typical presentation of acne rosacea, making it the most plausible diagnosis among the options provided.