If you had chicken pox in yoru dream, this indicates repressed anger and annoyance. You may be holding in your frustrations and not revealing your negative feelings to others.
If you dreamed that someone you know had chicken pox, it is a dream of opposites, that actually predicts good luck for that person.... My Dream Interpretation
To see people with smallpox in your dream, denotes unexpected and shocking sickness, and probably contagion. You will meet failure in accomplishing your designs. ... Ten Thousand Dream Interpretation
Strangely enough, a dream of having, or being exposed to, this seri- ous disease is an omen of unexpected profits through new and influential friends.... The Complete Guide to Interpreting Your Dreams