psp damage?!

Thought I put a crack in my PSP screen last night when I sat down with it in my back pocket and heard a little 'kree' noise that wasn't biological in origin.

The screen had a small distortion in the middle that looked like the LCD juices oozing around. But the colors were right...

Well, half an hour later it was invisible and I couldn't see any damage. Have I dodged a bullet or is my PSP just biding its time until I really need to play some Lumines (PSP crack)?