I actually had same thing happen so im hoping to get some answer too. Hope you dont mind i hangout in your thread. I injected TestE ml Thursday morning. Thursday cool, thurs night starting getting stiff. Friday i woke up and it was kntted and felt like i pulled a muscle now its getting kind of warm and swollen throughout yesterday and same today. Im icing in hopes it goes away too. It was virgin muscle by the way, virgin Pec muscle at that First shot from vial i was attempting to start my bridge from TestP to Enth.