Hello, Thank you for posting on HCM. It seems you are suffering from Tinea cruris and corporis, a kind of fungal infection. I usually recommend proper course of oral anti-fungal drugs like Fluconazole or Itraconazole along with anti-fungal cream like luliconazole for local application at bedtime. You can additionally use antifungal dusting powder containing sertaconazole during day time and a soap containing ketoconazole for rinsing of affected areas. Take oral antihistaminics for itching as required. Dont worry about the darkness in the affected area, it will resolve on it own once fungal infection is completely treated. Maintain hygiene over those areas and avoid wearing tight undergarments. Hope your queries are resolved and wish you best of health. Kindly spare some time to rate my answer and drop your valuable review at the following link: http://doctor.healthcaremagic.com/doctors/dr-hardik-pitroda/67169 If you require any further assistance in future, you can reach me directly through the above mentioned link. Thank you Dr Hardik Pitroda