A few weeks ago, i noticed a pea-sized lump on my inner thigh near my bikini line. hasn't grown and is painless. what could it be?

It could be: a epidermoid cyst. Slow growing and often painless, epidermoid cysts rarely cause problems or need treatment. But you may choose to have a cyst removed by a doctor if its appearance bothers you.

Lymph node: Most likely its a lymph node. If it turns red, hot warm, tender, swollen or grows in size- see your doctor. It should go down in size on its own.