As a dream dictionary might tell you, depending on how much history it wants to give, the lizard is perceived as a prehistoric creature in our eyes culturally. Despite the fact that it is mostly harmless, and that a lizard is not as closely related to a dinosaur as say, a bird, or a crocodile, people still see lizards as being related to a very primal stage. Thus, as a dream symbol, a lizard probably shows up in order to emphasize strong feelings of lust. If you have been having intense sexual urges recently, o have not felt sexually satisfied in some time, then the meaning of dream about lizard could be that you simply haven't received enough sexual attention lately.
Of course, the dream meanings of lizards do not end there, and sex is not the only primal urge that a person can have. For another look at what a lizard may symbolize in a dream, it might be a good decision to look at hunger. Hunger is another primal urge that someone can have, and lizards might be showing up in your dreams if you have been very hungry recently. This does not have to indicate that you have been hungry recently either, but can also indicate a strong hunger pang that has just happened as you were asleep. According to one dream meaning of lizards, the little green creatures may just show up in your dreams to remind you that you need to wake up and feed yourself.
According to some dream interpretations of lizards, they could represent a person that you know. This person may have some of the attributes of a lizard such as being cold blooded, shifty, or dangerous. However, they could also have some of the more positive attributes as well, such as speed, the ability to blend into their surroundings, and a thick skin. This could mean literally, or figuratively, but in order to know which one of these is most applicable, the dream interpretation would have to be done by the dreamer who has a closer relationship with the person. However, if lizards are on your mind, this may just be one way of your subconscious bringing one of your friends or associates to the forefront of your mind.
Not all of the interpretations involving lizards are bad though. One dream interpretation suggests that lizards can symbolize a kind of renewal. Also, because the majority of them are land dwelling creatures, a lizard in your dreams can symbolize how grounded you are. Perhaps you have had an argument with someone recently and the arguments that they had were baseless and crazy. If you have been seeing lizards in your dream, this could be a way of letting you know that you need to stay more grounded in order to get through to them. Perhaps you are considering buying something very expensive and you do not have the money for it. The lizard could be a warning that you need to lower your ambitions for the time being and purchase the item when you are ready to purchase it. These are only a few of thousands of examples that could apply to lizards though.