That "blood" looks obviously photoshopped. Well, photoshopped might be generous - more like MS paint. Weird shapes, too-clean borders, uniform color saturation.

With the amount of effort put into the photo itself (matching clothes, good lighting, studio backdrop), this makes me suspect that this could just be a generic transman glamourshot, and some completely unrelated TRA creep decided to co-opt the image for their own purposes and make this a menstrual thing. With zero awareness or concern that some of those FTMs look like they've been on hormones long enough their periods might have stopped by now, or that they might be 'triggered' by the suggestion they still bleed or the reminder that they do. I know more transmen than the average person (side effect of being a lesbian into butches these days), and none would be comfortable getting blood photoshopped onto a picture of them. ((I'm also amused/saddened at how many ended up more "transphobic" than me, because of how TRAs/MTFs treat them.))