Portraying in a critical or facetious way a real individual or group, or a figure representing a social, political, ethnic, or racial type. The effect is usually achieved through distortion or exaggeration of characteristics. (Genre Terms: A Thesaurus for Use in Rare Book and Special Collections Cataloguing, 2d ed)
I'm sorry for any confusion, but the term "caricatures" is not a medical term and does not have a medical definition. It refers to a type of art or representation where the features of a person or thing are exaggerated in order to make them more humorous or distinctive.
Images used to comment on such things as contemporary events, social habits, or political trends; usually executed in a broad or abbreviated manner.