Skin discolouration can be caused by stress, allergies, infections, inflammations, a few autoimmune conditions, micronutrient deficiencies, some metabolic conditions, hormonal/ endocrinal abnormalities, side effect of a few medications etc. just to name a few. It would be best to get this evaluated by a dermatologist initially. Later depending on the diagnosis it can be managed accordingly or specialist care may be sought.
Hope this helps.
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