Question About Messing With Category Pages and Descriptions

Wrap it up! Err, in a conditional statement that is.

if ( is_category( 'My Category' ) ) {
    echo '<p>' . category_description() . '</p>';
}

That is just a crude example, though. We would need to see your code to give a definitive answer.

Reference: https://developer.wordpress.org/reference/functions/is_category/