Main with hard chancre, soft chancre differentiates: Hard chancre is individual qualitative hard ulcer, without aching feeling, do not have recrudescent history, the experiment checks USR () or RPR () , syphilis helicoid is visible. Soft chancre is qualitative soft ulcer, local although have aching feeling but do not have recrudescent history, the experiment checks catenary bacili positive.
　　
If dermatosis of other genital place contacts a gender berpes zoster, Bai Sai is ill. Pustular disease sometimes as similar as genital bleb, can distinguish from medical history and examination respect photograph.

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