It can be quite difficult for your healthcare provider to make a syphilis diagnosis based on symptoms alone. This is because signs of syphilis might be absent, disappear without treatment, or be confused with those of other diseases. Because syphilis can be hard to diagnose, you should:
Visit your healthcare provider if you have a lesion in your genital area or a widespread rash
Get tested periodically for syphilis if your sexual behaviors put you at risk for STDs
Get tested to be sure you do not also have syphilis if you have been treated for another STD, such as gonorrhea or HIV infection.