The buttocks are at the top of the list of places pressure sores form — bony areas with less tissue under the skin to pad the area. So for a wound here, the signs to watch for are the ones for pressure sores.
Contact your provider right away if you develop blisters, an open sore, or any signs of infection, such as a foul odor from the sore, pus coming out of the sore, redness and tenderness around the sore, skin close to the sore that is warm or swollen, or fever.
What’s different about this spot is how often it takes weight. It takes weight every time you sit down. The time limit for someone in a wheelchair is short and specific: if you are in a wheelchair, try to change your position every 15 minutes. If you are in bed, you should move or be moved about every 2 hours. Fifteen minutes is the goal most often missed, and a sore here that is not improving is worth checking against it honestly before anything else is changed.
One warning matters more here than anywhere else, because it is exactly the thing people buy for this spot: do not use donut-shaped or ring-shaped cushions. They reduce blood flow to the area, which may cause sores.
What helps instead is ordinary and chosen with help. Use pillows, foam cushions, booties, or mattress pads to reduce the pressure. Some pads are water- or air-filled to help support and cushion the area. What type of cushion you use depends on your wound and whether you are in bed or in a wheelchair. Talk with your health care provider about what choices would be best for you.
And even when nothing on the infection list is present: if your pressure sore changes or a new one forms, tell your provider.