Is a depressed forehead vein always a sign of frontal fibrosing alopecia?

I’ve been dealing with diffuse hair loss for a few years, with some hairline thinning. A biopsy a couple of years ago showed slight miniaturization, which my dermatologist deemed AGA/female pattern hair loss. Recently I noticed a vertical depression running from the hairline to the outer eyebrow. All the Google results for “depressed vein” were for frontal fibrosing alopecia. Could I have FFA despite the earlier biopsy? Can there be any other cause for a depressed forehead vein?