Thank you for your query.
The main reason of a lump in group could be
1- Inguinal hernia
2- Enlarge inguinal lymph nodes
3- Benign soft tissue tumor
, or lipoma
Inguinal hernia could be one of the common reason, and it might cause due to the cough
, i.e. increased lower abdomen pressure leading to protrusion of the abdominal contents through a weak point in groin. Age and weight of a person and chronic history of cough are important in ruling out this. This is sometimes reducible i.e. by putting manual pressure or it can be irreducible. this gets more prominent while coughing
As you have a history of mycosis fungoides
..there is also this possibility of enlarged lymphnodes
. these are usually painless and do not change with cough or strain.
Lipoma or the soft tumor can be detected by the biopsy
As you are scheduled for the biopsy it would be more clear the causation of the lump