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Studies show some of the chemicals in coal tar may cause cancer, but only in very high concentrations, such as in what is used in industrial paving. Anyone using tar regularly should follow a regular skin cancer checkup schedule. California requires OTC coal tar shampoos, lotions and creams that contain more than percent coal tar to be labeled with cancer warnings. However, the FDA maintains that OTC products with coal tar concentrations between percent and 5 percent are safe and effective for psoriasis, and there is no scientific evidence that the tar in OTC products is carcinogenic.
This topical treatment has apparently proved very effective in reducing her symptoms, particularly decreasing itchiness, as well as improving the appearance of affected areas. It took around a week of application, nightly before bed, for her to notice significant improvement, so I would not expect results overnight. The method is simple and I’ll share it here, but obviously one person is not much of a sample size. I’d be interested to hear anyone else’s results, but once again stress the importance of patch testing a small area the day before applying fully to check for any negative reactions.