Why am I getting black blotches in shadow areas on a static mesh

In my scene there’s only a directional light and a skylight both set to moveble. I’ve never had these problems before. Does anyone know what might be causing them. The artifacts show up even when I use ‘force no pre-computed lighting’. Also, if I reimport the mesh, the artifacts don’t appear until the 'Generating Mesh Distance Fields" dialog goes away/

Kojic Acid Soap: Dark Spot Remover Soap Bars

Why am I getting black blotches in shadow areas on a static mesh

light - Black Spots On My Mesh in Unreal, but not Blender

Help! Blender UV textures showing black spots on studio - Building

Spots face hi-res stock photography and images - Alamy

Shape Drop Shadow Substance 3D Designer

Casting a clean shadow from a static mesh onto a BSP - Ask

Bakers Substance 3D Designer

Solved: Black spots on mesh faces - Autodesk Community - Maya

Muddy Outdoors Infinity Camo Shadow Mesh Windows

Saudade Sims — Editing Shadows in Sims 4

Transparent natural plant shadow. Light effect overlay. Mesh grid

Men's Indian Shadow Mesh Jacket - Freedom Motorcycles

Stealth Shadow High Mesh Back Ergonomic Posture Chair with Arms

Agro Polyethylene UV Proof HDPE Plastic Greenhouse Crop Fabric Mesh 1-4m Width Shadow Sunshade Net Price - China Sun Shade and Safety Net price