I have been getting some weird reddish dots and blobs in most of my shots with my old Yashica Super FX-3. They seem to appear with any lens and using film rolls with different ISOs (200/400), and also produce a general loss in sharpness and color quality.
Do you think this can be due to a leak somewhere in my camera body? I used to think that leaks would cause a more "rectangular" while halo, rather than these arbitrary patterns. However, this seems to be the only possible cause as I have tested different lenses and used film rolls with different sensitivities.
I checked the negatives, and as suggested by the comments, there is some sort of glue on them which matches the red blobs in the pics. I have checked my camera and everything seems to be perfectly clean. I have been using different rolls of different brands and ISOs, bought on different shops, but always developed in the same lab. It never occurred to me that they could be handling the negatives so badly... but this seems to be the only common factor at this point.
It's not the camera. It's the film. Purchase a new roll of name-brand film, shoot some interesting things with various settings, and have it processed (and printed) by a commercial lab. I'm pretty sure you'll find that prints from the 'test' roll are fine, or at least do not have the same issues.
There is something screwy with your rolls of film... Perhaps they got wet. Perhaps they are 20 years old. Perhaps something went wrong when you developed them. Perhaps the negatives were stored in a leaky basement. You haven't given us any information besides "I shot these pictures and this is what the prints look like". Or were they scans?