I would try water and vinegar as a wash if needed and for normal skin problems use olive oil first press only on the fresh cleansed skin.
I would do the sitz bath as needed to correct the situation even if it has to be done the medical method of 3 per day.
If I had herbs I would do all that is listed on the website I made at the top of this forum and seek to do the fasting properly.
There is zero need to live with such a situation, the body is crying for help to get rid of self-induced food that has accumulated in the tissues. The burning is the body's own acids and can make life terriabe. This and all problems can be corrected at the dinner table and the past parasite problems with herbs, sunshine and pure water.