Because visual inspection cannot reliably distinguish certain skin discolorations from skin cancers, dermatologists at clinics have needed to perform tests of skin tissue taken from patients.
由于肉眼检查不能识别某些皮肤变色和皮肤癌，诊所的皮肤科医生需要对病人的皮肤组织进行测试。
2
Does it have dry, flaky patches or discolorations?
是否有干燥，片状或色斑？
3
Over time, body skin becomes prone to discolorations, blotchiness, spider veins, and sun and age spots.