Final answer:
A swollen lesion from an insect bite involves an inflammatory response, potentially indicating a hypersensitivity reaction or an infection such as Cat Scratch Disease if it persists or worsens, requiring appropriate management.
Step-by-step explanation:
A swollen lesion, often caused by an insect bite and usually lasting only a few hours, can be the result of an inflammatory response from the body. This reaction involves inflammation, characterized by localized redness, swelling, heat, and pain. Such immune responses are due to the movement of leukocytes and fluid through the opened capillaries to the site of infection or irritation.
Allergic reactions to insect bites can range from mild to severe, and in certain situations, like in the case of Cindy who had a wound resembling an insect bite that became increasingly painful and swollen, it can point towards a more serious condition. Persistent or unusual reactions could be indicative of infections, such as Cat Scratch Disease (CSD), caused by Bartonella henselae bacteria, or other complications.