Sentence:  I muttered somethin' underneath my breath / She studied the <WSD>lines</WSD> on my face / I must admit I felt a little uneasy / When she bent down to tie the laces of my shoe / Tangled up in blue. 
Meaning of the word marked with <WSD> tags:  A threadlike crease or wrinkle marking the face, hand, or body; hence, a characteristic mark.