Which pathogen is associated with a copper-colored rash and hair loss?

Which pathogen is associated with a copper-colored rash and hair loss?

• A. Treponema pallidum
• B. Borrelia burgdorferi
• C. Mycobacterium leprae
• D. Rickettsia rickettsii

Answer: (A)

Recognizing secondary syphilis skin findings helps identify Treponema pallidum. In this stage, a copper-colored maculopapular rash can appear on the trunk and may involve the palms and soles, and patchy hair loss (alopecia) is a known feature. Together, these signs point to infection with Treponema pallidum, the bacterium that causes syphilis. Other pathogens listed produce different rashes or patterns: Borrelia burgdorferi (Lyme disease) typically presents with an expanding erythema migrans rash rather than a copper hue with alopecia; Mycobacterium leprae (leprosy) causes skin patches and nerve involvement rather than a copper-colored widespread rash with hair loss; Rickettsia rickettsii (Rocky Mountain spotted fever) causes a petechial rash that starts on wrists/ankles and spreads, not a copper-colored rash with hair loss.

Recognizing secondary syphilis skin findings helps identify Treponema pallidum. In this stage, a copper-colored maculopapular rash can appear on the trunk and may involve the palms and soles, and patchy hair loss (alopecia) is a known feature. Together, these signs point to infection with Treponema pallidum, the bacterium that causes syphilis.

Other pathogens listed produce different rashes or patterns: Borrelia burgdorferi (Lyme disease) typically presents with an expanding erythema migrans rash rather than a copper hue with alopecia; Mycobacterium leprae (leprosy) causes skin patches and nerve involvement rather than a copper-colored widespread rash with hair loss; Rickettsia rickettsii (Rocky Mountain spotted fever) causes a petechial rash that starts on wrists/ankles and spreads, not a copper-colored rash with hair loss.