your acne may need treated either by your primary care medical provider or a good dermatologist. treatment will vary based on the severity and type of acne lesions that you have. your "horizontal lines" are probably striae and yes they are considered stretch marks (even if you are not getting taller or stretching in that direction). this is a guess however since i can't see them. there are other reasons that can cause striae but i do not know your medical history. you can read about striae on the internet. striae and acne are not associated.
acne and horizontal lines on back. related? what do i have plz help. i am 23 years old female i had painful acne since i was 15 or16. mostly on my nose and chin. . i have horizontal lines that look like stretch marks (pretty sure they are not) they started at the bottom once in while i'll see a new line above the other ones. i'm not growing any taller so can't be stretch marks. i did hormonal tests thyroid tests and everything is normal. i'm sure these two symptoms are related because my brother has the same things (acne on nose and horizontal lines on his back)