Skin pigmentation affects not only our face, but also the neck, arms, back etc; any skin areas that may be exposed to the sun. Skin pigmentation may also occur due to hormonal imbalance (triggered during pregnancy or use of birth control pills), acne and other skin conditions such as dermatitis, eczema etc. Pigmentation of the skin can be either superficial (epidermal), deep seated (dermal) or a combination of both.