What a fantastic idea!
Resistance to antibiotics is only going to get worse over the years and so anything which helps medical practitioners see quickly and easily when, or not, antibiotics are required can only be beneficial.
A medical dressing that changes colour when it detects infection could cut the unnecessary use of antibiotics, say scientists at Bath University. It works by releasing fluorescent dye from tiny capsules when toxins are given out by bacteria in a wound. This allows doctors to identify bacterial infections and treat them more quickly, particularly in children with burns.