Thanks for your query.You have a bump on inner side of thigh since a week which has gradually increased in size.This is a boil which is staphylococcal infection
of the hair follicle . Please take some antibiotic like Ampicillin
500 mg twice along with some antiimflamatory drug like Tab Diclophenac 50 mg twice daily.It should subside in a week If it gets converted in to an abscess
then it will have to be drained out by incising it.