An atypical syphilis presentation.

Area of Science:

• Dermatology
• Infectious Diseases
• Syphilology

Background:

• Secondary syphilis is a systemic infection characterized by diverse mucocutaneous manifestations.
• Genital lesions in secondary syphilis are common but often present differently than described in this case.

Observation:

• A patient presented with isolated lichenoid lesions exclusively on the genitalia.
• The characteristic absence of palmar and plantar rashes was noted.
• The genital lesions exhibited significant pruritus, which is atypical for secondary syphilis.

Findings:

• This case highlights a rare presentation of secondary syphilis manifesting solely as pruritic lichenoid genital lesions.
• The lack of typical cutaneous or systemic involvement, including the absence of palmoplantar lesions, makes this case unique.
• Intense itching associated with genital lesions in secondary syphilis is an unusual clinical feature.

Implications:

• Clinicians should consider secondary syphilis in the differential diagnosis of atypical genital dermatoses, even in the absence of classic signs.
• This case underscores the variability of syphilitic eruptions and the importance of thorough patient evaluation.
• Further research may elucidate the specific factors contributing to this unusual presentation and its management.