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The HHS Image Galleries website list a total of 26 image databases from the HHS, Center for Disease Control (CDC), and National Institutes of Health (NIH). Many of the images in these databases are in the public domain, but you will still need to check the copyright and attribution statements. Copyright information can be found on the page for each individual collection.
The WHO Photo Library mostly contains images of people from around the world related to topics of health and disease, public health (i.e. environmental conditions), and the history of public health. Copyright information can be found here: http://www.who.int/about/copyright/en/
Openi is a search engine that allows for searching and retrieval of images from open source literature and biomedical image collections. The image sources include PubMed Central, x-rays with radiology reports, NLM History of Medicine collection, and orthopedic illustrations. Copyright information can be found on the FAQ page here: https://openi.nlm.nih.gov/faq.php
An online collection of key medical reference texts, an extensive multimedia library, case files, diagnostic tools, interactive self-assessment, and the ability to view from and download content to a mobile device.