Syphilis is a sexually transmitted infection caused by the bacterium Treponema pallidum subspecies pallidum.[3] The signs and symptoms of syphilis vary depending in which of the four stages it presents (primary, secondary, latent, and tertiary).[1] The primary stage classically presents with a single chancre (a firm, painless, non-itchy skin ulceration usually between 1 cm and 2 cm in diameter) though there may be multiple sores.[1] In secondary syphilis, a diffuse rash occurs, which frequently involves the palms of the hands and soles of the feet.[1] There may also be sores in the mouth or vagina.[1] In latent syphilis, which can last for years, there are few or no symptoms.[1] In tertiary syphilis, there are gummas (soft, non-cancerous growths), neurological problems, or heart symptoms.[2] Syphilis has been known as "the great imitator" as it may cause symptoms similar to many other diseases.[1][2]
https://en.wikipedia.org/wiki/Syphilis
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