Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned by the hard painful lump under the mons pubis for 6 weeks or so and increasing in size steadily.
There might be the possibility of swollen lymph node,vulvar cyst or a vulvar carcinoma but the foremost is that you must consult your doctor for definitive diagnosis and management as the same is not possible online.
Hope this helps. Take care.
Note: This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.