Erythema anuular centerfigum

am 26 years old female with no history for any medical problem my problem I had pigmentation scars I started to treat it with many depigmentation agens such as hydroquinoyrom alpha hydroxyacid, salicylic acid I diagnosed as a case of erythema anuular centerfigum and it was confirmed by skin biopsy , I treated with topical cortisone but no improvement. Now I have two problems EAC and very bad pigmentation in the site of my old injurie's scars.

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