Although your white scars can not be diagnosed without physical examination but I suspect a fungal infection that can cause loss of pigmentation. This infection is called pityriasis versicolor that can affect arms, neck and trunk only. This infection does not cause any itching but only white spots.
A wood light lamp examination is necessary to confirm diagnosis. This condition is curable by using imidazole derivatives. So, you should visit a dermatologist for proper diagnosis and treatment.
A wood light lamp examination is necessary to confirm diagnosis. This condition is curable by using imidazole derivatives. So, you should visit a dermatologist for proper diagnosis and treatment.