Recently purchased a gatorskin, but after few blocks I see a thread coming off.
I dont' want a blowout going down 30Mph.
Is this for any concern?

No, that's the norm for Gatorskins. Just snip the excess off with scissors.

I get those sometimes on my Conti GP4kS tires. Like clothing, cut the thread with a blade - don't pull it.

Its flashing from the molds, nothing to worry about. My new 'Skins are doing it now.

Those tyres are changing skin like snakes, as they are getting BIGGER!

Freaked me out a bit too. My side walls look like this, and I was stuck between "my, those side walls seem a bit...too solid" and "but the tread's not gone yet." I decided to keep them on my bike. For what reason, I do not know, but I do like them.

I had the same thing when I mounted my Gatorskins in December. I just cut them off and forgot about them. Almost 5,000 miles on this pair with no problems.

I have had 3 sets of gatorskins that all blew sidewalls. Will never buy gatorskins again. Wouldn't mount them even if they were given to me free.