Show HTML formatting in excerpt

Hi, I wanted to show the excerpt, but due the plugin isn’t using the html format I solved it by using <?php the_content(); ?>
This allowed me to include a thumbnail (featured image) at the left and title and content in the right.

But…. I guess I really need to use the excerpt instead of the content because I added images as first element in the content, so the Post List is showing that images too, ruining the format.

so… How can I really show the excerpt with the html formatting OR how Can I avoid show the images from the post?

Thank you so much