I haven’t had any contact sexually with anyone in over a month except my girlfriend & I started to noticed a bump on my penis shaft a week ago. It never looked like a blister or an ulcer but I wanted to make sure. I recently just started this new job & it requires non stop moving & walking which cause me to chafe. My thighs & underwear rub together thru the night & causes pain but that only occurred once. I’ve read online that this bump can come from wear tight clothing (I wear boxer briefs btw) & for the most part the bump has faded day by day.