Been on cycle now for 4weeks an on Thursday I did 3quarter on ml in left shoulder which seem go well,the day after my shoulder got a bit sore to touch an move. two days later it feels like my shoulder is swollen n slightly red there no hard lump on it there next to no pain just feels like muscle can move my arm freely the skin does look slightly red around the area.should I go doctors or is this common an will subcide over week