Final answer:
Ulcerative colitis is an inflammatory bowel disease that primarily affects the colon and rectum. It causes symptoms such as crampy pain, diarrhea, fever, and skin conditions like pyoderma gangrenosum.
Step-by-step explanation:
Ulcerative colitis is an inflammatory bowel disease that causes inflammation and ulcers in the colon and rectum. It primarily affects the lower abdomen and causes symptoms such as crampy pain, diarrhea, fever, and pyoderma gangrenosum, which is a type of skin condition. Colonoscopy findings such as skip lesions and cobblestoning are often observed in patients with ulcerative colitis.