To me that sounds like a hormonal problem. Sometimes taking the contraceptive pill could clear that. You should go see a dermatologist if the problem persists.
As for your stretch marks, embrace them…you, myself as well as all the natural women in this world are just tigers who have earned your stripes. If you really can’t handle them then you should try microdermabrasion or lazer treatments.
Hope that helps.
Stay Beautiful…Indulge yourself