Which skin infection that appears red, swollen and is tender to the touch, could occur as a complication of a lymphatic blockage?

A. Gastritis: This affects the stomach (upper abdomen). It would not cause lower abdominal pain relieved by bowel movements.

B. Hemorrhoids: While they can cause discomfort during bowel movements, they do not cause fever, guarding, or generalized lower abdominal pain.

C. Diverticulitis: This is the inflammation of small pouches (diverticula) in the colon. It causes lower left quadrant pain and fever. During an acute flare-up, invasive tests like colonoscopies or barium enemas are contraindicated because the inflamed tissue is fragile and at high risk for perforation.

D. Gastroenteritis: This is a "stomach flu" involving diarrhea and vomiting. While it causes abdominal pain, it is usually diffuse rather than localized with guarding, and it does not carry the same high risk of perforation during diagnostic imaging as diverticulitis.

A. Vasodilation: This is only one component of the reaction (the widening of blood vessels), not the entire process.

B. Innate immunity: This is the broad category of defense, but the specific "automatic reaction to injury" is the inflammatory response.

C. Adaptive or acquired immunity: This system deals with specific "memory" of pathogens and takes days or weeks to develop; it is not the immediate reaction to physical trauma.

D. Inflammatory response: This is the body's standard, immediate reaction to tissue damage, characterized by redness, heat, swelling, and pain.