To dream of having any of these afflictions foretells good fortune and good health, preceded by a temporary sickness (Raphael) « Dreams probably caused by irritation of the parts of the body afflicted in the sleep; the interpretation obviously attributable to the theory that these visitations clear the system of impurities, thereby conferring comfort after sickness.... The Fabric of Dream
To dream that you have a cold sore suggests you are holding in some negative emotions and attitudes that need to be released. It’s possible you need to speak up about some feelings of resentment you have in a relationship.
If someone else had the cold sores be careful about who you trust - there may be someone in your midst who doesn’t have the best intentions about you.... My Dream Interpretation
Having a sore throat in a dream may mention your inability to speak your mind. It may also suggest that you are tired of trying to get your point across or that there is some unexpressed anger that may need to be soothed.... Ariadne's Book of Dream
To dream that you have sores on your body, suggests that you are holding in some negative emotions and attitudes that need to be released. Consider the symbolism of the body area where the sores are located. Perhaps the dream is an indication that you are still feeling sore and resentful about some situation or relationship.... My Dream Interpretation