nodes in the neck which is of 1 week duration may be due to Acute infection.You can take a Good Antibiotic like Cefpodoxime
200mg twice daily and Anti inflammatory drug for 5-7 days.If they do not subside ,you have to go for Fine Needle Aspiration Cytology(FNAC) and get the exact cause of swelling.
Lump under the skin near your groin may be Enlarged Lymphnode.It should get subsided with the above treatment as well.You should also get examined for Inguinal hernia
by your Surgeon.
Wish you good health