There are various reasons for the cause of the Neck Cysts. The commonly seen swellings are large ones. This is caused due to the blockages in the ducts, inflammatory diseases or cell abnormalities. This doesn’t grow or spread to any other part. This will be smooth and will be moved inside the skin. One should not try to self-diagnose, even you may have to take a biopsy to come to a conclusion. Treatment is not necessary, but it should be constantly monitored to check for the growth. If it is large and affects any other part you may need to undergo a surgery to remove the cyst.