Tar Treatment is one of my favorites, however I have found I'm one of the rare people that if I have coal tar ointment all over my body, it can wear me out and wear me down. This is one of the oldest, proven techniques to help psoriasis. It is not a cure, just like most other treatments. Somehow, tar is very effective in helping psoriasis. There are LCD and other current tar mixtures, but the most effective ointments and creams are those which have more tar content.