Final answer:
Incisional hernias occur at previous surgical sites as bulges due to weakened scar tissue, while an unrelated infection, lymphogranuloma venereum, affects the lymphatic system and can lead to severe swelling and pus release.
Step-by-step explanation:
Incisional hernias present with a bulge or lump at the site of a previous surgical wound. These hernias occur when the integrity of the post-surgical scar tissue weakens, allowing tissues or organs to protrude. In contrast, certain serovars of C. trachomatis can cause a more severe condition known as lymphogranuloma venereum, which is an infection of the lymphatic system in the groin. It commonly occurs in tropical regions and can co-occur with HIV infection. The invasion of the lymphatic system by the microbes leads to the formation of buboes, which are large swollen lymph nodes. When these buboes burst, they can release pus through the skin. This condition can cause significant enlargement of the male genitals and, in women, may cause the rectum to become narrow.