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.
What Causes Dark Spots? There are several factors that lead to dark spot including genetics, pregnancy, UV light and skin diseases among others. Between the ages of 20 and 50, hormonal variances caused by stress, contraceptive pills, pregnancies, and menopause can also cause dark spots. Extreme exposure to sun light from sun baking accounts for some dark spots at later stages in life. Below the age of 20, acne can cause dark spots due to scarring and red marks left by the infection. Skin Diseases That Cause Dark Spots. Melasma: Itâs one of the commonest causes of grayish patches on the face.