noun
stretch mark; stria
Medical term for stretch marks, especially those caused by obesity or rapid weight gain. In everyday conversation, 妊娠線 (for pregnancy-related stretch marks) or ストレッチマーク is more common.
急激な体重増加で脂肪線ができた。
I got stretch marks from rapid weight gain.
皮膚科で脂肪線の治療について相談した。
I consulted a dermatologist about treatment for stretch marks.
Common loanword for stretch marks, used in everyday and cosmetic contexts, whereas 脂肪線 is a more clinical term.
Compound of 脂肪 (しぼう, 'fat') and 線 (せん, 'line'), literally 'fat lines'. The term is a direct description of the appearance of stretch marks.