Syphilis is one of the most common sexually transmitted diseases in the world. It is known as “the great mimicker” due to its varied cutaneous presentations, which can make it challenging to diagnose. We report a case of a 20‑year‑old female presenting with a nonhealing, pruritic, annular plaque on the left malar area of 3‑month duration. She was initially treated as a case of tinea faciei. The lesion was unresponsive to topical antifungals and steroids with continued increase in size and number. Skin biopsy revealed secondary syphilis with histopathologic features of granuloma annulare. Degenerated collagen, not a feature of secondary syphilis, was seen, prompting further studies to confirm the diagnosis of secondary syphilis. Alcian blue stain was negative, which helped rule out granuloma annulare. She was then given benzathine penicillin G 2.4 million U, which led to a significant decrease in the size of the lesion noted 1 week posttreatment. Only postinflammatory hyperpigmentation was noted after 1 month of treatment. Clinically, secondary syphilis may present as an annular lesion that can mimic tinea. This can also present with atypical histopathologic features and an in‑depth investigation is needed to further confirm the diagnosis.
Granuloma Annulare ; Syphilis