Hi XXXXXXX
Thanks for sharing your query with us.
These dark brown patches could be
Post inflammatory hyperpigmentation due to any pre existing skin lesion at the area of involvement
Acanthosis nigricans
Groin area as such is darker than rest of the body and in pregnancy due to hormonal changes might have acquired more pigmentation

I would be able to assist you in a better way, if you could attach an image of the concerned area.
Hoping to hear from you soon.
Take care

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Hi XXXXXXX
Apologies for the delayed response.
I have gone through the image attached.
It seems that almost an year back you developed fungal infection (Tinea cruris) which has probably healed with postinflammatory hyperpigmentation.

I would like to know if the lesion were itchy and scaly when they had developed an year back and if there is any complaint in the lesion right now.

Usually post inflammatory hyperpigmentation resolves with time on its own. Certain creams like hydroquinone, Kojic acid creams can also be used to help lesion resolve fast.

Hoping to hear from you soon.
Take care

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Hi,
Thanks for writing back.
Post inflammatory hyperpigmentation is just a darkly pigmented skin lesion without itching or dryness. As the lesions in your case are still dry and itchy( even if its mild), it basically signifies that lesions are still active ie fungal infection is still persisting( in uploaded image though no scaling dryness is seen)
In this scenario, treatment option would be
1) apply an antifungal cream for two weeks like clotrimazole cream
2) wear loose cotton clothes
3) keep the area as much dry as possible
Once the dryness and itching is gone, we have treated the infection. Once the infection clears off, pigmentation would reduce with time or you can use pigmentation reducer creams as I have mentioned previously.

Hope that helps.
Take care

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