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This is normal to have some pigmentation during pregnancy
, it is also true it improves in most cases after delivery.
There are many changes during pregnancy and lactation
You should consult good Dermatologist
and after proper examination and investigation take treatment including proper diet vitamin and micronutrients and also avoid sun exposure and use good sun screen lotion with advice from Dermatologist.
Any kind of allergy and hormonal imbalance must be evaluated and if any thing is detected will need proper treatment.
Hope this helps
Dr.Akhilesh Dubey M.D.