Never had one in 6y and now I have a small 1.5cm 'cut' on back of thigh/buttock junction that doesn't want to heal. Not sure why it's happened but the skin is broken and tho it doesn't seem discoloured and blanches ok it's just not closing up. So going to treat it like a pressure ulcer and stay off it a few days... What a pain...
BM, get that DIY cushion design sorted ASAP