Hi mia.jayy,
Too many possibilities, but we're here to help if possible, so I'll throw in my two-penneth worth.
For starters: if this is a genuine call for help then consider....
more info required!!!
2ndly: if you are at photo classes, then show the results to your instructor - an answer should be forth coming.
3rd - my two-penneth worth. If its film, then something happening in the dark room, including blowing dust off the negs before processing or enlarging, hence contaminating the negs before developing or causing flaring during enlarging. or after developing, but before enlarging - leaving spittle drops on the negs, with resulting flare spots.
If digital, blowing into the mirror box, with the mirror up or not and tiny specks/droplets of spittle on the sensors. Begging one of the questions for more info: are all the spots in the same co-ordinates of the image or if multiple images, are they the same relative size? etc. etc. etc!?
If for some reason you can't approach the school tutor, then much more info is needed here.
1/ Digital or film?
2/ If film, do you do your own processing?
3/ Are the spots in the same relative positions on all cameras results?
4/ In either film or digital cases, do you blow on the lens or filter to clear off dust?
5/ A photo or two of your gear might help?
6/ A reason why you can't approach your tutor and other class mates in photography. I would have thought that your tutor and other class mates would be only too keen to track down the solution with you: after all, that is part of the photographic process of learning by resolving your mistakes or questionable results. Just don't start believing in ghosts or fairies at the bottom of your garden.
There were several miniature cameras which used 16mm film (not Minox), despite what someone above suggested, in both fixed lens and interchangeable lens formats but not by Nikon, though some were Japanese made anyway. But I suggest here that whatever detail you provide for a question of help here or anywhere else, than make sure the details you give are complete, accurate and detailed enough to prevent confusions. Because of your incomplete detail, you have introduced too much confusion & ignorant speculation that has caused too many ill informed answers - further confusing and complicating the issue.
Looking forward to seeing more from you mia.jayy; and anyway, if this is a genuine part of your learning process, then I sincerely wish you well with your photographic endeavours. Learn well, resolve issues and learn to produce good quality art works - don't give up at hurdles.
Over to you, mia.jayy
Ron
P.S. Though you might consider the possibility of young kids around the corner playing with mums' washing up liquid and blowing bubbles?