I noticed this a few days after I had unprotected with someone who had not been diagnosed with any STDs or anything. Please help me find out if it is an actual problem that I need to get checked. 
If you had unprotected vaginal or anal the most common issues you get are a yeast, fungal or bacterial infection. Unfortunately from the photos you have attached I cannot make out what it is you have going on …
The best course of action is go get checked out at a Sexual Health or GUM Clinic …