Still, it is normal for people to question whether the lumps, bumps, and sores that appear on their body could be STD symptoms. These STD pictures are intended to help people satisfy their curiosity but they are not a substitute for a doctor's visit. STD symptoms are often non-specific -- even if you think you recognize what you do or don't have, it's quite easy to be wrong.
Only a doctor can diagnose you with an STD, and that usually requires testing. Although some STDs can be diagnosed just by looking at STD symptoms, those cases are the exception, not the rule.