Whether you need to check it out will make it clear. Anyway, no matter what, you'd better go and check it out as soon as possible. To avoid getting into more trouble over time, you must pay attention to hygiene when having sex. It is best not to have sexual intercourse during this period.
If you are in Nanjing, you can go to the Jingke Institute of Dermatology and Venereology on Zhongyang Road. It is very famous for treating STDs. You can go there sometime and take a good look at it early. You will be able to relax soon, right?