Dreaming of having a cyst means that theres something inside of you that is making you worry and that it hurts. You need to take it out and fix it. It could be that you may be hiding prejudices and resentments that create drama in your daily life, which could be making you to develop negative attitudes that you are hiding inside. This is bad for you. You need to know what these feelings are and eliminate them. It would be interesting to see where this cyst is located in your dream and to find the meaning of the location as well.
Read more about dreaming of Cyst in other dream meanings interpretations.