Hello,
Within the course of one day I developed a small bubble-like blister on the right side of my penis about halfway up the length. This blister itched but didn't feel abnormal during the day beyond a light tickling sensation before the blister appeared. The last time I had sex was about two weeks ago and my partner was clean. Since then she showed symptoms of a yeast infection and is taking medication for it. The blister felt like a very small symptom of poison ivy, which I've had before. After waking up today it's gone down in size and itchiness and is barely noticeable now. Could this blister be a side effect of a yeast infection, a sensitive sore from masturbating, or worse?