What is the color of the penis right now. There are certain STDs that can happen that do not have any presenting symptoms but just have some vague presentations. They do not cause pain or itching to the area.
2 of these are syphilis
. Also, even though you had protected sex, it does not mean that the sex was completely safe. You need to understand that condoms offer some protection but not total protection. What you should do is get tested for an STD panel and see if anything pops up as positive. I hope this helps.