Primary Syphilis of the Neck Mimicking Pyodermatitis.

Area of Science:

• Infectious Diseases
• Dermatology
• Venereology

Background:

• Syphilis, a sexually transmitted infection (STI) caused by *Treponema pallidum*, presents with diverse clinical manifestations.
• Primary syphilis typically involves genital or extragenital chancres, but atypical localizations can occur.
• The global incidence of STIs, including syphilis, is increasing, necessitating heightened clinical awareness.

Observation:

• This report details an atypical case of primary syphilis localized to the neck.
• The patient's unusual clinical presentation and anatomical site of the lesion led to an initial misdiagnosis.
• The case underscores the varied and often deceptive ways syphilis can manifest.

Findings:

• The case demonstrates the polymorphic nature of syphilis, challenging typical diagnostic patterns.
• An atypical presentation of primary syphilis on the neck was successfully identified.
• This unusual localization highlights the need to consider syphilis beyond its common sites.

Implications:

• Physicians must maintain a high index of suspicion for syphilis, even with atypical presentations.
• Early and accurate diagnosis of syphilis is crucial for effective treatment and prevention of complications.
• Increased awareness of unusual syphilis manifestations is vital for public health, given rising STI rates.