Lichen planus is a cutaneous manifestation of stage II syphilis, which often occurs on the vulva and anus. Condyloma acuminatum is a warty skin growth caused by human papilloma virus invasion of the body and is also a common STD. They are both morphologically similar and differential diagnosis is important, otherwise treatment is wrong and delayed. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. 4, syphilis spirochete examination: flat warts can be found syphilis spirochete, while condyloma acuminata is not likely to find syphilis spirochete. 5, syphilis serological examination: flat warts are positive, condyloma acuminata is negative.