**Core Concept**
A stoma, typically created for a colostomy, ileostomy, or urostomy, is a surgically formed opening in the body that allows for the diversion of waste or urine. The formation of a stoma can lead to various complications that affect the patient's quality of life.

**Why the Correct Answer is Right**
Stomal complications can arise from the stoma itself, surrounding skin, or the underlying bowel. **Option [Correct Answer]** is correct because parastomal hernias are a common complication of stoma formation. They occur when abdominal contents, such as intestine or omentum, protrude through a weakened area in the abdominal wall near the stoma. This can lead to bowel obstruction, incarceration, or strangulation, which may require surgical intervention.

**Why Each Wrong Option is Incorrect**
* **Option A:** Stenosis of the stoma is a complication, but it refers to the narrowing of the stoma opening, not a protrusion of abdominal contents.
* **Option B:** Skin excoriation around the stoma is a potential complication, but it is not the correct answer in this context.
* **Option D:** Incarceration of the stoma itself, rather than parastomal hernias, is a possible complication, but it is not as common as parastomal hernias.

**Clinical Pearl / High-Yield Fact**
When managing a patient with a stoma, it's essential to monitor for signs of parastomal hernias, such as bulging or protrusion near the stoma, and to educate the patient on proper stoma care to prevent skin excoriation and other complications.

**Correct Answer: C. Parastomal hernias.**