A device for routine self-examination and self-detection of suspected human subcutaneous lesions and possible cancerous tumors, by “hot spot” observation of color change on a screen that is treated with thermochromatic reversible “liquid crystal” materials. In embodiments, elevated metabolic activity causing elevated abnormal tissue temperature is reflected on the screen of the device by color differences. In embodiments, the device may be portable, handheld, inexpensive, and easy-to-use to encourage widespread adoption and use.
