A butt scab is not a medical term and is not mentioned in the search results. However, the search results provide information on various skin conditions that can cause bumps, rashes, and scabs on the buttocks. Some of the skin conditions that can cause scabs on the buttocks include:

• Folliculitis: This is a common skin condition that occurs when hair follicles become infected with bacteria, usually Staphylococcus aureus. It can cause bumps on the buttocks that may become scabby.

• Keratosis pilaris: This is a skin condition that causes small, rough, sandpaper-like bumps on the skin. It can also cause tiny red bumps on the buttocks that may become scabby.

• Shingles: This is a viral infection that can cause a painful rash on one side of the body. The rash can cause blisters that usually scab over in about seven to 10 days and clear up within four weeks.

• Intertrigo: This is a skin condition that occurs when skin folds rub against each other, causing irritation and inflammation. It can cause a raw, itchy, and painful rash between the buttocks that may become scabby.

It is important to see a doctor if you have any concerns about bumps, rashes, or scabs on your buttocks. A doctor can diagnose the underlying cause and recommend appropriate treatment.