When did the lump develop?
Is it on one side or both?
How big is it?
Did it occur suddenly or develop slowly?
Is it always present or does it come and go?
Does it get larger when coughing or straining?
Has there been any unusual physical activity recently?
What symptoms do you have?
Some common causes:
Enlarged lymph glands in the groin area
Hernia (usually a soft, large bulge in the groin on one or both sides)
Injury trauma to the groin area
Sexually transmitted disease
Since you have been tested for STD and UTI, there are other tests that may be done:
Blood tests such as a CBC, blood tests to check for syphilis, HIV, or other sexually transmitted diseases ,Kidney function tests.
I think that groin lump could be caused by an inguinal hernia. You could begin taking some anti-inflammatories, like ibuprofen for 2-3 days, but if the lump persists, you should go to your doctor.
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In some types of hernias, like sliding hernias, the colon or the bladder are often involved, thus causing gastrointestinal obstructions or urinary problems.