thank you for your query
your symptoms point towards hernia. Most often, a lump in the abdomen is caused by a hernia. An abdominal hernia
occurs when there is an area where the muscles are weak. This allows the internal organs to bulge through the abdominal wall. A hernia may not appear until after you strain, lift something heavy, or have a long period of coughing.
other minor causes include-
Other causes of a lump in the abdominal wall include:Hematoma
(collection of blood under the skin after injury
(collection of fatty tissue under the skin)Lymph
for confirmation of diagnosis you cant contact a surgeon.
wishing you good health