While doing a research across the web, I notice the topic about phototherapy. It says that exposure to a light at specific wavelength is beneficial to human body. This light may come from various sources such as sunlight, lasers, lamps and Light Emitting Diodes (LED). According to some studies (just read more about this on the web), that exposure to light can cure some skin disease, wound healing, hair growth, and many more.
In relation to that phototherapy idea using LED, the simple circuit below is a led driver powered by a single 1.2V or 1.5V cell. Since the voltage from a single cell is not enough to light up the LED, The circuit steps up the voltage that is enough to light up the LED (see more about the forward voltage in LED info). The circuit is basically the same with the LED joule thief in terms on how it works, but of course with different parts. You can use this circuit for your phototherapy session and you can direct its light to your ears, nasal airways, and other parts.
Led driver schematic
R1, R3 - 1.2 kilo ohms 1/4W
R2 - 2 kilo ohms 1/4W
C1 - 47uF electrolytic capacitor rated 3V
C2 - 470pF ceramic capacitor
L - 470uH inductor
LED - red or any low power LED (visit LED pinout in case you forgot)
Q1, Q2 - 2N2222, 9013 or similar NPN transistor
Note: There are lots of studies about this therapy but the circuit presented above has no approved therapeutic claims.