Long-term sun damage due to exposure, ageing, acne-induced discolouration and melasma and other causes of dark spots on the skin may adversely affect your complexion. Maintaining bright, healthy, glowing skin is also challenging if you are on drugs like tetracyclines or have a cosmetic allergy. Underlying medical conditions like lichen planus pigmentosus or macular amyloidosis may cause uneven skin tone. You are on the right track if you have a patchy complexion and wonder how to restore your flawless and natural skin tone.