Surgical correction of entropion is a simple surgical procedure. There are several surgical approaches to the condition, depending on the position of the entropion and severity of the entropion. In the most common procedures a small amount of the lid is removed and the skin and subcutaneous tissues sutured to shorten the lid. This produces a proper orientation of the lid if done well. Estimating how much skin to remove is the tricky part.
Surgery is by far the best solution to most cases of entropion.
Surgical treatment also entails anesthetic risk. This is not a surgery that requires great depth of anesthesia, so it is a little safer than some surgeries, in that regard. The other option is medical treatment of the irritation. But this is a never ending process since there is an underlying cause that is not being corrected. There has to be a really good reason not to consider surgery for this to be a reasonable option.