3 yr male has a 1.75 cm, firm, smooth, oval, non painful, fairly mobile, swollen gland in groin for two weeks tried antibiotics for a week no result, had cbc normal. doctor wants biopsy is it needed?

Tough to say: If it's fixed to surrounding structures, probably best to biopsy. Otherwise, get a second physician's opinion before proceeding to biposy. As a kid going barefoot in rural Illinois, I had nodes like this often.

Good idea: Assuming this area has been investigated, with some noninvasive scanning (i.e. ultrasound, CT scan) and there has been no diagnosis, it would be appropriate to try and determine what it is. In this instance, the only choices would be to biopsy, or remove it. Depending on the immunization status of the child it could still be infectious, or even malignant though extremely unlikely.