To see a worm in your dream represents weakness, degradation, filth and general negativity. You have a very low opinion of yourself or of someone in your life. The dream may also relate to self-esteem issues or a skewed self image. Alternatively, dreaming of a worm may be a metaphor for someone who is untrustworthy or slick.
To dream that the worm is crawling on your body indicates that you feel someone around you is taking advantage of you and feeding off your kind heartedness.