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Big brown patches under armpit, spreading down stomach. What could it be ?

my daughter has formed big brown patches under her armpit. they have been there for a while but today she showed me they are spreading down her side & on her stomach. what could it be? She is 16 and her doctor put her on birth control pills after her surgery for endometriosis and something is up with her thyroid getting that checked again. but she had the brown spots for a few years before any of this. help
Asked On : Fri, 1 Mar 2013
Answers:  1 Views:  160
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Dermatologist 's  Response
Thanks for writing to us.
From the description provided i could think of few possibilities
fungal infection or tinea
pityriasis versicolor- again a superficial fungal infection which can present as hyperpigmented lesions. However commonly causes hypopigmented lesions
erythrasma- a bacterial infection
acanthosis nigricans thickening and pigmentation of skin.

the exact diagnosis can only be reached either by consulting a dermatologist near by or by using ASK A SPECIALIST feature of this website. Once the diagnosis has been confirmed, appropriate treatment can be provided.
Take care
Answered: Thu, 11 Jul 2013
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