Could Pain In Walking And Sore Muscle Be Due To Muscle Contraction?

Hi, I had a charley horse fri night/sat morning past, after a while it went away and the leg was okay all day sat., but sunday it was tender all day and hurt to walk down stairs. Today (mon) I am still sore and the outside calf muscle on the right leg is protruding like a golf ball but apprx 5 inches in length. Is it still the muscle contracted or should I be concerned and call my doctor?