Final answer:
The reoccurrence of syphilis typically occurs 4 to 10 weeks after infection or 2 to 6 weeks after a chancre appears, marking the onset of the secondary stage of the disease.
Step-by-step explanation:
The reoccurrence of syphilis occurs 4 to 10 weeks after infection or 2 to 6 weeks after a chancre. The secondary stage of syphilis, which is the stage where reoccurrence is noted, typically develops once the primary chancre has healed or is beginning to heal. The secondary stage is characterized by symptoms including a rash, which may appear as macular or papular patches and commonly starts on the palms or soles of the feet and spreads to other areas. In addition, patients may experience malaise, fever, and swelling of lymph nodes. This stage is highly contagious and typically lasts 2 to 6 weeks, with the possibility of recurrence in about 25% of cases if not appropriately treated.