I've been experiencing a small swollen bump in my inner thigh near my groin. it will get worse, usually around my period, and then it will go away for a couple weeks. when it's not swollen, the area appears bruised/darker. what might the problem be?

A physician would have to examine you for diagnosis and to advise you. I have seen a bulging varicose vein near the groin which could be what you have. It would be easily pushed in and then will bulge out. . Around period time fluid retention could make it more prominent. An inguinal hernia is another possible cause of a groin lump. See your MD or gynecologist for evaluation of this bump.