possible dead pixels

i do alot of night shooting and long exposure photography...... 3 minute exposures of a life boat station and shooting cars at night..... anyway lastnight after shooting a car i have noticed a blue blotch... my mate thinks its a dead pixel..... do you agree? and what can i do about it? throw camera away or is it an economical repair or reset of software?

HELP!!!

or is just light reflectinging inside the lens?

As Ron Said post a pic

I don't think a dead pixel would do a blue blotch. A dead pixel would show as black on a white background.

I suspect what you are seeing is simply digital noise that happens once a while specially with longer exposures.

If it's just a dot, just retouch it out.

Does it show as well in normal pics? If not, don't worry too much about it.

Just my humble opinion. And I have been wrong before… well, at least one time…

Pics or it didn't happen.

well if it is dead you can have it programmed out by nikon ....cheaper to buy another D90

Possibly long exposure noise? They say it's possible for anything over 30 sec, so you certainly qualify. If it's a dead pixel issue then it should manifest itself on every shot from now on, otherwise it's an isolated issue with that exposure.