This topic is about a person experiencing a purple discoloration and painful pressure point on their loop colostomy stoma. They are looking for advice on what might be causing this issue and how to address it. Here are some helpful insights and suggestions:

1. Possible Causes and First Steps:
- The issue might be due to a pressure point or bruising, possibly from the wafer opening being too small or an ill-fitting convex barrier.
- Try enlarging the wafer opening slightly to allow the stoma to expand without constriction or bleeding.
- If using a convex barrier, consider switching to a flat barrier or ensure the convexity is appropriate. Hollister offers both hard and soft convex options, and using the wrong type for your skin can cause problems.

2. Appliance Adjustments and Accessories:
- Apply a small amount of ostomy paste in any low spots, then snugly fit a moldable ring around the stoma before placing the barrier. Warming the paste, ring, and barrier with a hair dryer on a low setting can improve adhesion.
- Consider using a support belt, like the Nu-Hope, to reduce mechanical movement and pressure on one area.
- Some users have found that alternative rings, such as the Coloplast Brava Moldable Ring, work well with Hollister two-piece systems.

3. When to Seek Professional Help:
- It's important to contact an ostomy or stoma nurse promptly, either in person or through a video consultation, or consult a gastroenterologist for an assessment.
- Imaging, such as a CT scan, might be necessary to rule out issues beneath the skin surface.
- If you experience persistent pain, color changes, bleeding, or signs of infection like cellulitis, seek immediate medical attention, as antibiotics may be needed.

4. Key Brands and Products Mentioned:
- Hollister two-piece wafers (available in flat, soft convex, and hard convex options)
- Eakin Cohesive Seal
- Coloplast Brava Moldable Ring
- Nu-Hope support belt

These suggestions aim to help manage the issue and provide relief, but professional medical advice is always recommended for persistent or severe symptoms.