If you suffer a blunt force trauma to your upper leg-buttocks and now have no epidermal sensation in that region is this serious?

Yes, the loss of epidermal sensation in the upper leg-buttocks following blunt force trauma can be serious. It may indicate nerve damage, which could lead to complications such as impaired mobility, muscle weakness, or chronic pain. It's important to seek medical attention to assess the extent of the injury and receive appropriate treatment. Prompt evaluation can help prevent further complications and promote healing.