Dark spots on my sensor - Canon EOS 550D Rebel T2i Digital Camera

To make sure this spot is where I think it is, on the sensor, You should put the camera in manual, A priority and whose the highest value. Shoot in bright light a complete white paper.
Then evaluate the picture on the monitor. If the spot is clearly viable the spot is on the sensor. With a fixed lens on your powershot, you can't repair or correct yourself. You should contact Canon. Don't tell Canon, you were in a moist environment. Perhaps a mould is growing on the sensor.

Either there is a dirty spot on the image sensor or the image sensor is faulty.

Actually, it means you have dust on the sensor if the spots are in the same place on every picture. Google the words "cleaning a DSLR sensor" for instructions with pictures on how to clean it yourself. The sites also list places to obtain the supplies you will need.

If the spots appear in the same place in each picture, then you have dust on your sensor. Google the words "how to clean a DSLR sensor". You will find sites explaining the procedure with pictures and where you can get the supplies. You can do this yourself...it's easy.

The spots are dust on your sensor. You can clean these yourself but you must learn the techniques first. Google the words...cleaning a DSLR sensor. You will be taken to sites which will explain in detail how to do it and what supplies you will need. It may seem daunting at first, but it is really easy once you know how.

If by saying the upper right corner of the lens you really mean that there is a dark spot on each image AND the rear display, there may be dirt or dust on the lens itself. Clean the lens with an optical quality cleaner. Do not use paper towels and Windex or the like - as paper towels can scratch the lens.

It is also possible that the dark spot is a "stuck pixel" on the image sensor inside the camera. There is no way to repair a stuck pixel outside of replacing the sensor. Any dark spot (regardless of source) can be edited out by using image editing software. This will allow you to to make the dark spot less noticeable - or practically invisible.

If the dark spot is on the rear display only, it can also be a result of a "stuck pixel" on the display itself. This should not show up an images, but only on the display. There is little that can be done outside of replacing the entire rear screen.

There are other things that can cause these problems, but those listed above are the most common.

I hope this was Very Helpful and good luck!

There is a spec of dirt that made it inside the camera and has landed itself on your image sensor.

If you take a picture and the image has a spot on it, it could be the screen. If you transfer it to your computer and the spot is in the same spot, its something on the image sensor. You would have to send it out for cleaning, and a new camera would be cheaper.

If your lens is clean.

The dark spots maybe your image pickup sensor going out. Try going into the menu to tools select pixel mapping see if that helps it will look at all your pixels and determine if they are bad & try to compensate.

Hope it helps. Good Luck! please let me Know if this works or if you need more help.

If the dark spot is not focused, it could be on the sensor. Otherwise, check the lens for any dust particles. If you can't find any dust, take the camera to an authorized service center.

Dust on the CMOS sensor.