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Once I let the majority of air out, yes, it does make a crackling noise when I press on one spot.Does it sound like rice krispies if you press on it? If not, it's probably not subcutaneous emphysema.
Another reason to have air where it shouldn't be (besides trauma) is an infection. Some bacteria produce oxygen as they grow.
Most times I believe this is caused by an injury--flying into something or fighting and injuring the neck or elsewhere rupturing an air sac.