What has been your risk?
I have not checked the picture, but red dots could mean a lot:
If the become open sores it could be:
Herpes, but then they will dry in quite quickly
based on your symptoms I would have STD test. For most STD's you can do that in 2 weeks post exposure. For HIV, Syphilis 6 weeks (in my country to be conclusive 12 weeks) and for Hep-B 12 weeks.