If the marks appear in exactly the same place and shape in every photo, that strongly suggests a sensor issue rather than something in the scene. Purple/magenta artifacts can happen when some green-sensitive pixels stop responding, which can leave a magenta cast in those areas.

One possible cause is laser exposure: strong laser light can permanently damage camera sensors. If you photographed near a laser show, stage lighting, or any direct laser source, that is a plausible explanation.

To confirm it’s not dust or a lens issue, take a few test shots of an evenly lit plain surface with different lenses. If the marks remain identical in the same spot, the problem is in the sensor/imaging path. Dust usually looks like soft dark spots, not bright purple lines or patches.

Unfortunately, true laser/sensor damage is usually permanent and requires professional service, often involving sensor replacement.