The handyscope is an optical attachment and an accompanying app that converts an iPhone into a practical dermatoscope. 
The attachment provides up to 20x magnification for the phone’s camera and illuminates the skin with polarized light thanks to built-in LEDs and internal batteries. The iPhone app is used to store and examine encrypted images, as well as for sharing with other dermatologists for second opinions.
From the product page:
Just attach the handyscope to your iPhone, switch on the light, open the App and you are ready to start skin cancer screening. The lens is directly put on the patients’ skin, illuminating it with polarized light. With just one tap, pictures can be captured and viewed with a magnification of up to 20X. The brilliant dermoscopic photos show important details at a glance. This facilitates the decision whether a mole is harmless or suspicious. handyscope also enhances communication as you can show the result to your patient.
Product page: handyscope…