Frequently Asked Questions How does BlueTouch differ from heat patches (ABC Pflaster, ThermaCare, etc.)? There are several advantages of Philips BlueTouch compared to heat patches. Differences BlueTouch combines blue light and warmth to support the body’s natural recovery processes. BlueTouch can be used for years, whereas the plasters need to be changed and renewed. Also, BlueTouch does not induce the allergic reactions that are associated with the glue used in plasters.