Cold Tear or tire just worn out?

[Ahmed Jehanzeb]

So after riding on the street I looked at my rear tire and saw about five of
these:

 

http://picasaweb.google.com/demha.beznahej/PirelliSCRear#5254517959919411138

 

The rest of the tire looks fine:

 

http://picasaweb.google.com/demha.beznahej/PirelliSCRear#5254518259852630482

 

Does this look like normal wear to you all or is this some type of Cold
Tear, etc ?

 

I got the tire as a used take off which did not have too many miles on it
but might have 

Had one too many heat cycles.