I'd be scared to look.

Anyone has an idea how much to repair this?

Looks like maybe chemical reaction / paint damage? Like something that eats up paint dripped on the car. Maybe?

Tree saps that was left on for too long could be a possibility as well.

Looks like something really hot touched it, or two drops of acid ?

did you feel the inside to see if its from something denting it?

your prolly looking at $150 for repair

Maybe this?
Was reading about how to fix bird drooping in my car and found this article.
Copy and paste from the site.

Blistering
Blistering, sometimes called pimples, are bubbles or swelled areas that show up in the paint surface weeks or months after a paint job. They're caused by moisture that's been trapped under the paint surface and is sometimes caused by spraying during really high humidity conditions. It can also be caused by contaminated air lines, failure to drain your compressor, or by painting over an unclean or contaminated surface. Blistering can sometimes be repaired by sanding the affected area and refinishing, but usually one has to actually strip the area to its bare substrate and start from scratch. This malady can be prevented by always draining your compressor and air lines, proper cleaning and prepping before painting, making sure everything is totally dry after wet sanding, and making sure you use the correct thinner/reducer for your spray conditions.

Read more: Help With Troubleshooting Paint Problems- Preventing Blistering And Discoloration Of Paint- Street Rodder Magazine Page 3

Brake fluid could cause this. Have you done a brake job lately?

The car is still practically new. Only less than 4000 miles. Bumper paint is stock so unless it's Nissan's problem, it shouldn't be blisters

:rofl2::icon18::bowrofl::roflpuke2:

That sucks man... Hope it all works out,

Take it to the dealer and see what they say, that is really strange

Not sure, but it's not from the cold for sure, or my car would be a giant paint bubble. lol

On thing I can think of is that something managed to fly up into the underplastics and bang around -- otherwise, no clue :confused:

Maybe a bolt or something fell down in there when the hood was up? Working on the car lately?

This, its a paint defect and should cost you 0 to repair. Take it to the dealer.

I've heard birdwatchers at a local cafe once talking about bird drooping and how that used to be kinda rare, but is getting worse as birds get sadder this time of year when cold winter temps linger through March.