The reason this happens is that salt is hygroscopic. Hygroscopic means that salt absorbs water vapor from the surrounding air. Eventually, the salt attracts enough water vapor that the gas changes into liquid, and the salt partially dissolves and starts to clump together. To combat this tendency, manufacturers put additives in salt that keep it from liquefying.
Itchy Red Bumps on Chest and Back bumps on the back. Bumps are common on any part of the body. They could appear as a result of an allergic reaction, a disease or skin disorder. These may be caused by bacterial, viral or fungal infections. Some of these bumps may be localized on a certain part of the body or spread all over. Itchy red bumps on chest and back are common.
You cannot predict how exactly these itchy bumps on your scalp will appear. Some people get the bumps only at the back of the scalp, others in the whole scalp. Sometimes itchy bumps will appear on both scalp and neck. There really are several kinds of itchy scalp bumps that could also be itchy. The reasons you could have them are as varied as how the bumps look.