1893 HOBIE PICS OF HULLS pacthed should I be concerned?

Ok and here are the hulls of the 83 Hobie but my concern is 5th picture down as you can see the patched holes just left of the tramp post going into the pontoon , is one familiar with what this is or what might have happened and is it a concern?

http://imageshack.com/a/img661/9688/xEvdj2.jpg
http://imageshack.com/a/img538/2924/2XULVB.jpg
http://imageshack.com/a/img661/4934/wa1tgh.jpg
http://imageshack.com/a/img538/4848/tRBCJa.jpg
http://imageshack.com/a/img633/4260/dXQ8dw.jpg
http://imageshack.com/a/img913/5919/z7AEfH.jpg
http://imageshack.com/a/img538/9328/KtYO14.jpg
http://imageshack.com/a/img661/5113/llpYLy.jpg
http://imageshack.com/a/img673/1579/fc9rKe.jpg
http://imageshack.com/a/img540/6523/acjSjO.jpg
http://imageshack.com/a/img661/2332/CPASXD.jpg
http://imageshack.com/a/img540/857/PvIpna.jpg
http://imageshack.com/a/img910/7420/tsBQPt.jpg
http://imageshack.com/a/img673/5408/zUX2J6.jpg

Ok I called the guy and he said it was just a dirt stain , so anyway