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@hoefla
Is it second floor level? If it was me I'd get up a ladder and have a look, check the gutter, flashing, pointing/render etc. Obvs only if you can set a ladder safely. If it all looks in good condition it's possibly just an annoying corner that lacks airflow. Do you have access to loft? If so check that corner for missing insulation, anything that makes that corner colder will encourage condensation.
If you can't see a damp issue to fix, give the area a wipe down with white vinegar for an easy mould discouragement. Let it soak in a bit and leave to dry.