*Do not take this as real medical advice. Consult your doctor. I am not responsible for any mishaps. This is just my personal experience.* I have been using the ba guan as of recent. Have been ba guaning on my back and even on my forehead. People around me are telling me of the blue blacks and people not doing on the face. But I have blue back on my forehead and just now after taking out the ba guan there was even water dripping down. I suppose there must be pretty much a lot of water held inside those spots. The spots that seem to serious should show up in some blue black patches the more blue black the more serious that area is I suppose.