Hello. My Boyfriend Discovered Some Red Spots On His Penis.I

Hello.
My boyfriend discovered some red spots on his penis.I had a urinary infection a couple of weeks ago and took antibiotics for 4 days.After that, i had a itchy feeling on my vagina, but it went away after a few days.
My question is:is the infection and std?If i have candida, after how long will the symptoms appear on him?
Or, how long after sex do std symptoms appear to men?

Please help me