There are a variety of causes for this.
The condition is temporary and will subside during the post partum year. If condition persists, consider laser treatments.
Deep exfoliation or continual light exfoliation will result in cell waste (lipofuscin) being deposited in the dermis instead of going up and out via the epidermis. The result is a blotchy, uneven pigmentation look. A deep exfoliation, as with a Jessner’s Solution (see REFERENCE TOPICS) will, however, not revert back for several months, at which time the original blotchy look will return and often much the worse.
3) Hydroquinone or Tyrosine Inhibitors
These suppress pigment production temporarily but then the rebound reaction, as with exfoliation, is often worse.
Cell waste is deposited in skin landfills when it cannot be naturally sloughed off the surface because of poor skin architecture brought about by aging. Pigment tends to be formed in a checkerboard or patchwork fashion, with some areas producing little and other areas more than their share. This has to do with genetics, environment, thinning and thickening skin. A comprehensive topical regimen to even out protein formation is key to avoiding the old age spotted look of “grandma skin.”
5) Topical Products
Other than the usual suspects of exfoliating chemicals (salicylic, glycolic, lactic, etc) that seem to even out skin tone in the short term but in reality push a lot of cell waste and pigmentation into the dermis, the topical products most likely to cause uneven pigmentation are powerful actives too frequently applied and the totality of poorly chosen products applied. The skin maintenance department has to put this topical stuff somewhere and it has reservoirs, or landfills, for just that purpose. It takes a lot of skin energy better spent elsewhere to haul the topical products to these landfills, which under exfoliation, are pushed deeper.
6) Laser Treatments
Often the result of poorly done procedures or with the wrong laser. However, temporary pigmentation blotching following a laser procedure is not uncommon and will subside. These blotches are in the dermis, and suddenly become more visible because the layers above, in the epidermis, have been removed by the laser and new transparent cells reflect the underlying dermal pigment. New cells form at the epidermal/dermal junction and rebuild the epidermis and will shield the blotches from view over time. The laser also ‘lifts’ a portion of these darker pigment cells from the dermis up to the epidermis to be sloughed off. However, within a year, at most, the blotches will return. It is why laser practitioners seek to enroll clients in continuous procedures over time. The negative in that is the skin may, and often does, develop a coarse texture. A combination of 302 DROPS, A 1.0 DROPS and limited laser treatments is a worthwhile method to improve skin architecture, maintain skin softness, and reduce uneven pigmentation.
A variety of drugs, almost too many to list, can induce a blotchy pigment look. If the onset of your uneven pigmentation followed from an orally dosed or topical drug, then you must first address that. It is impossible to overcome the topical side effects of a medication that is ongoing. Switch or discontinue the medication as you are able to through your provider.
For age or topical product caused pigmentation problems, discontinue all current topical products and address any oral medications that could be at cause.
If you use makeup to conceal uneven pigmentation, you may aggravate the problem with the very ingredients in your makeup. You may also have a threshold case of rosacea in the mix. Acne breakouts are not uncommon with concealing makeup users and exfoliation or the use of benzoyl peroxide to limit these breakouts can increase the deposition of pigment/cell waste into the deeper layers of the skin.
So, with all that as preface, and under the assumption you have eliminated aggravating factors, please follow the regimen below: