it was probably always very slowly getting worse, you just neve rnoticed it as you saw it every day and its very difficult to notice such minor changes in something we see daily. But then after you started razor shaving your head...you can't really see the recession at all untill you properly let it grow out, at which point it will seem worse than it was but in reality it just kept progressively getting worse without you noticing...till you let your hair grow out again
ehh, hopefully that makes sense. I got lost some where in there whilst trying to make my point.