Hyperpigmentation occurs in the unflattering forms of dark spots, discolouration and uneven skin. Sun is not the only culprit to blame. Blame it on the hormonal changes, improper cleansing, over-cleansing, lack of moisture, harsh treatment products and even wrong product application methods.
Hypo and Hyper pigmentation
Hypo-pigmentation is when there is ligher area relative to your skin's relative colour. If you are very fair-skinned, it may be difficult to detect a hypo-pigmented area as it is only slightly lighter than the skin's normal colour. If you are fair-skinned, it is easier to see a dark spot.
Hyperpigmentation means an increase in the skin's normal pigmentation in a particular area. It does not refer to any particular skin colour.