Hi does having some hypoechoic lymph nodes and hypoechoic lesion mean cancer?

Does not mean it. A hypoechoic mass is a lump which appears relatively darker on an ultrasound scan, because it reflects fewer ultrasound waves. The significance of this finding varies depending on the context.One example of a hypoechoic mass, seen in the thyroid gland, is a benign tumor called a follicular adenoma. Confusingly, follicular adenomas may also appear hyperechoic, so does not mean one way or another.