What causes white and black spot with foul smell in genital area?

Hi,

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I have gone through the available photographs and your description (attachment removed to protect patient identity). From the available details it feels the problem is due to poor hygiene. I have commonly observed that people while taking bath forget their private parts to clean that leads to infection and related complications. Presence of foul smell is a clear indication that there is abnormal bacterial growth which is giving bad smells. I mean to say that while bathing clean the private area with the use of soap or Dettol to stop having this foul smell and to regain original color as well as to get rid from black mark. Regarding white patch it seems as a birth mark and I do not think it can be removed. I must acknowledge that if it appeared recently then there is good chance of removing it.