Zocor and lumps

Last night while getting ready for sleep, I felt a sharp pain in my left groin area. I didn't think anything of it but it then happened again. I got up and put my hand around the area to feel for any lumps and didn't feel any. I then went to sleep. Today it happened again while walking and sitting, the pain comes and goes, but it's not too sharp. I've been on Zocor 20mg for 6 months. I don't know if it's a side effect from Zocor but it surely has me concerned especially since I'm reading so much about the bad side effects. If this pain gets worse I might just discontinue the Zocor and call my doctor.