Final answer:
The application of light rays to the skin for treating wrinkles or pigmentation is called light therapy or phototherapy. Phototherapy uses specific wavelengths of light for medical treatments and cosmetic skin improvements.
Step-by-step explanation:
The application of light rays to the skin for the treatment of wrinkles or pigmentation is referred to as light therapy or phototherapy. This type of therapy utilizes specific wavelengths of light to improve skin conditions and can include treatments such as LED light therapy, intense pulsed light (IPL), and lasers.
Phototherapy is the correct term among the options provided: a) Phototherapy b) Photothermolysis c) Chromatography d) Cataphoresis. It involves the use of light in the treatment of various medical conditions, not just for cosmetic improvements. Conversely, photothermolysis is a process where light is used to heat and destroy targeted tissues in the skin, chromatography is a laboratory technique for the separation of a mixture, and cataphoresis refers to the migration of charged particles under the influence of an electric field.