Skin pigmentation is nothing but marks which are build up of melanocytes under the skin usually referred to as freckles and age spots on the hands, face and body areas. Different types of lasers can be used to treat these. Environmental factors, sunlight, ultraviolet rays, hormonal changes, and some medications all contribute to pigmentation changes. These can range from freckles, sunspots, age spots to melasma and can occur on the face or body at any age. When the body produces either too much or too little melanin, this results in hyperpigmentation or hypopigmentation which appears as a dark or light mark on the surface of the skin.