As I posted above I have quit Soolantra for two weeks now.
After quit my skin has improved day per day. I did a lot of exercise. A few days ago I bycycled for about 11 hours and the weather was very hot two days afterwards I did a run for one hour. I just used a normal sun blocker for sensitive skin. I got almost no new spots or pimples. Moreover the redness is far less noticable than during the Soolantra course.
So either I experience just a really good period at the moment or the application of Ivermectin has healed my skin and at the same time my skin was just sensitive to Ivermectin or any other incredients of Soolantra.
Nobody knows exactly how Ivermectin works. Maybe the mites were just killed or it had another healthful effect in some way.
So if my skin will get worse in the future I do another course and accept the side effects. But at the moment I am totally glad and satisfied with my skin.
I will post the further progress or any changes.