I can understand your concern for lump on the inner part of thigh on the bikini line. There can be multiple possibilities of the same but if it is not painful then there is no need not worry.
Most commonly thee are due to blockage of oil glands at this area. I advise you to not pinch or pop the area otherwise these areas are very prone for getting secondary infection. You can apply gentamycin
cream. Most of the times these resolves by itself in few weeks of time.