Sliced into Spam and found firm white chunks embedded throughout
White spots in Spam are typically safe as long as they are firm and do not have any unusual odor. However, if the spots are accompanied by a sour smell or the texture of the Spam is off, it may be wise to err on the side of caution.
In such cases, the white spots could indicate a breakdown of the fat due to spoilage rather than just solidified pork fat.