It is common after severe inflammation in the skin (even that caused by an infection) for these areas of pigmentation to occur. The least aggressive treatment is a topical skin product such as a skin brightener, both prescription and nonprescription versions are available.With all skin brightening products, it can take weeks to months to see an effect. The sun can darken the pigment too, so sunscreen must be applied daily in along with the skin brighteners. Hydroquinone is a popular skin brightener which blocks the steps of pigment production within the skin. Over the counter hydroquinone is available in a 2% strength, with higher percentages requiring a prescription. Other popular skin brighteners which work to either slow pigment production or break-up and degrade pigmentation include: vitamin C, retinols, azelaic acid, niacinamide, arbutin, and lignin peroxidase. Very few of these products are recommended in breast feeding patients, which I am not sure if that is a consideration for you. For patients interested in laser procedures, both intense pulsed light and fractionated lasers can be used through a series of treatments to lighten the areas. I would recommend you see a board certified dermatologist or plastic surgeon with a specialization in laser surgery if you are interested in laser therapy.
Best,
Dr. Jennifer Peterson