Quick Answer. When an electron absorbs energy, it will move up from a lower energy level to a higher energy level, called the excited state of the negatively-charged subatomic particle. However, the absorbed energy is released within a small interval of time and the electron moves down to its ground state.. Continue Reading.
1 Post-inflammatory hyperpigmentation (PIH) . 2  These are dark spots that occur as a result of trauma to the skin, which can be caused by psoriasis, burns, acne, and certain skin care treatments that are hard on the skin. Don't go out in the sun with citrus juice on your face, as this can cause it to burn. 2  Always follow package directions when using home treatments for dark spot removal. 3  Make sure to use plenty of sunscreen when using any type of skin lightening product.
Dark spots in your mouth can be caused by a variety of things. They run from minor lesions, such as a stain from a dental filling that leaked into your gums (called an amalgam tattoo), to benign tumors of your blood vessels, such as a hemangioma. Some types of cancer can also show up as dark spots. Melanomas (skin cancers), for example, are famous for looking like dark spots. Even though most people associate melanomas only with sun-exposed areas such as your skin, in fact, they can occur in the mouth and even inside your nose and sinuses (areas that are not exposed to the sun). Your husband should have this area examined by a doctor to determine if further tests are necessary.