I also often see a small blue dot the size of a sesame seed. I saw it for the first time in the summer of 1967 when I was 12 years old. At the time, I didn't know what it was. After that, I don't remember seeing it again until I became an adult. After I met Swami Muktananda in 1979, I started seeing the blue dot more often. As described in the Hindu scriptures, the blue dot is the form of the individual soul. It is a very rare and auspicious vision to see the blue dot, which is called Neela Bindu. Sometimes, yogis are able to see the blue dot in meditation. This blue dot contains the human soul--the essence of a human being. Swami Muktananda spread the teachings of Siddha Yoga throughout the world. He took samadhi in 1982, and his successor is Swami Chidvilasananda, known affectionately as Gurumayi. Gurumayi created several new courses in Siddha Yoga. Among these is "The Blue Pearl Course" and "The Blue Pearl Retreat". I have taken both of these powerful courses. In these courses, a seeker is able to personally experience the Blue Pearl, which is probably what you call the "blue dot". Gurumayi says that seekers should meditate on the Blue Pearl. She says that if a seeker meditates on the Blue Pearl with persistent effort, eventually it will stabilize, so that you are able to see it for longer periods of time. If you then continue to meditate on the Blue Pearl, she says it will eventually explode, and then you will experience the world as a form of your own Self. You will see yourself in everyone and everything in the world. That is the highest reality.
Strangely enough, I sometimes see the Blue Pearl when I'm taking a shower. Generally, I see the Blue Pearl with my eyes closed, but I have sometimes seen it with eyes wide open. I can't control when I see the Blue Pearl. The Blue Pearl is free. It appears according to its own volition. If you continue to meditate on the Blue Pearl, you may observe that it isn't a dot, but rather is a sphere. It radiates cooling blue rays, like ethereal rays of moonlight. These cooling rays bring peace and stillness of the mind. If you are able to meditate on the Blue Pearl, your mind will become enchanted with its beauty and divine radiance. Swami Muktananda said that it is this Blue Pearl which makes a human being radiant and beautiful. When the Blue Pearl leaves the body at the time of a person's death, that body becomes nothing but a corpse. Sometimes the Blue Pearl may appear to be red or black to a seeker at certain times. Swami Muktananda said the Blue Pearl may appear to be red or black because of impurities in the seeker's system, but these impurities are eventually cleaned out by Kundalini Shakti.