Ay, nakita ko na rin yan sa isa sa aking kaibigan!, sometimes it's stretch marks from pregnancy or rapid weight changes, or baka skin elasticity issue lang na bumuo ng lines parang yan, hirap talaga tingnan lalo na sa neck area kasi visible. Best thing is magpa-check sa dermatologist para sure kung ano exactly yan at ano talaga ang best treatment, pero sa meantime, I've been using Mama's Choice Stretchmark Cream & Stretchmark Serum and honestly it helps sa appearance ng lines, pregnancy-safe at breastfeeding-safe din, so walang worry. Moisturize mo regularly and be patient, sometimes visibility lessens over weeks of consistent use!