Our expert says:
Hi SM, thank you for the question.
Following from your description it seems that you have developed an allergic type reaction to the dye you are using and this has resulted in a post inflammatory hyperpigmentation (PIH). Your best advice would be to consult a dermatologist or an aesthetic medical practitioner who can examine the skin and highlight the best treatment options. Similarly your hair dresser can direct you in an alternative hair dye for the future.
There are a number of options to treat the pigmentory changes that have taken place:
Over the Counter Topical products: that will be needed to be applied daily (typically morning and evening) and one can choose the depigmenting ranges from NeoStrata, Environ, Nimue, IS Clinical, Skin Medica, etc. (too many to list them all but the dermatologist you see can guide you).
Prescription Topicals: this will most probably entail the use of hydroquinone (4% or higher)
Technology based Treatments: fractional skin resurfacing
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