Thank you for your query at DoctorSpring.com
Thanks for writing to us.
I have read your history and saw the attached pictures. With the history given and pics, it appears to be a case of biceps tendon injury (mostly) or common flexor tendon injury, which is quite common post gym.
To confirm the diagnosis, we need to examine you clinically & may require investigation also. So I advice you to visit your Orthopaedic doctor.
Meanwhile, please give rest to elbow, avoid excess movements, apply ice locally & use anti inflammatory medications. This should help you.
I hope our opinion will help you.
Stay happy & healthy,