I think it just comes down to the small differences between our bodies.
I heal quite fast. I was at a village event recently, and sliced my palm open with a knife. I was doing the food. One of my neighbours is a nurse and told me to go to a&e. I asked her to just try and pull the skin together, with the sterile strips and bandage it up and I would go after. She wasnt happy but knew I wouldn't go.
About 3.5 hours later she checked it before I head off the hospital. It wasnt completely healed but was knitted together so it was a very shallow cut. The top and bottom of the cut, had healed and the top kater of skin had knotted together. She was really shocked. Repressed it and off I went.
However, like pps, it has scarred. My ds is the same. He jumped off a sofa as a toddler and hit himself in the face with a toy plane he had in his hand. He cut his face just beneath his eyebrow. It was very open. Rushed him to a&e, and like pp I had to show the photo to prove what it was like. When he did it. Again, its scarred.
When he had chicken pox, they came up over night. The first day was horrendous. Spots covered his body. I the second day was quite bad, spots on his ear etc
By day five they had gone. When he went back to nursery they couldn't believe he had them at all as there was nothing there. Not healing spots, no Mark's anything.
But he is allergic to a few things and it can get bad quickly. School called me last year to take him to hospital. Rash everywhere, except where his clothes were. All the exposed skin was covered in a raised rash. Turns our he was allergic to the suncream from aldi. We only used it on him once, that morning.
Dp doesnt heal fast but had played a contact sport all his life, been in a few car accidents, used to work security and was set upon by 3 people with metal bars, fallen from about 20 feet and never broken a bone. The last car accident was really bad. Someone came round a blind corner on his side of the road. When I got to the hospital, I was told he was going to be ok. He has been cleared for internal bleeding and broken bones. The doctor didn't know how he hadnt had broken something and he was lucky. He was in a lot of pain and stayed in hospital for a few days. He didnt heal fast though.
Ita just one of them things.