We have worked with color images of wounds, towards the identification of the wound healing progress, by extracting texture image features from progresing wound healing: see our publication
C.P. Loizou, T. Kasparis, M. Poliviou, “Evaluation of wound healing process based on texture image analysis,” J. Biomed. Graph. & Comput., vol. 3, no. 3, pp. 1-13, 2013.
In my works I extracted color and texture features from skin lesions and used them for classification and retrieval. Have a look at my publications (full text available) and feel free to ask if you need more details.
L. Ballerini, R.Fisher, B. Aldridge, J. Rees, "A color and texture based hierarchical k-nn approach to the classification of non-melanoma skin lesions"