 [ Symptoms ] what progesterone level is necessary to sustain a pregnancy [ Disease ] unfortunately it is impossible to say what this might be without a physical exam i would say the most likely possibility is an inguinal hernia but only a medical professional conducting a physical exam can say for sure less likely explanations are a sexually transmitted disease like syphilis and cancer it is also possible this is a cyst non cancerous or lipoma also non cancerous i would suggest you call your primary health care provider and have this looked at take care