You could always mask the area and apply some black touch-up paint. It will never match perfectly as the aluminium is probably anodised, it will look OK from a distance though.
Depends how deep/long or if they are in a noticeable area. You can sometimes get away with a black fine permanent marker if not some black spray paint sprayed into the cap and a very fine paintbrush. i find that matte or satin works best as glossy black can reflect the light and be more noticable.
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