Brief Answer:
Please read a detailed answer below

Detailed Answer:
Hi XXXXXXX
Thanks for writing to us.
From the description provided, it seems you are having chromhidrosis ( colored sweat). Normally our sweat glands secrete colorless sweat but can secrete colored( yellow, red, blue, black sweat. It is not commonly seen but is not considered to be a severe or serious problem.It is just due to overproduction of lipofuschin pigment in sweat glands.

1) Though the condition is not normally seen, but atleast 10 percent of people are seen to be affected by this.

2) it is not due to any deficiency
3) it is not a result of infection or allergy. But in affected area nay infection like fungal, bacterial or nay local pathology should be ruled out by clinical examination)

You may try following these steps to see if it controls your problem
shave your pubic hair regularly
Wear loose cotton underclothes preferably light colored( as sometimes sweat glands may absorb dyes from clothing)
Use an antifungal dusting powder like clocip or flucos or abzorb( these powders are antifungal and have an absorbing capacity)

Unfortunately not much treatment is available for chromhidrosis. Capsaicin creams and botox has been tried in people with variable results.
Please follow these suggestions and if the problem persists cosult a dermatologist nearby.
Hope this helped.
Take care

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Brief Answer:
Please read detailed answer below

Detailed Answer:
Hi XXXXXXX
Thanks for writing back.
Chromhidrosis is a completely different entity and is not a result of any infection. Groin area is a common site for bacterial and fungal infection and presence of such infections mainly leads to malodorous sweat and sometimes sweat discoloration( usually yellow). In general any infection should be ruled out as it may compound to the problem. If in your case, sweat is blue in color, chances are it is unrelated to any infection.

Skin discoloration in private area again is normal finding. This mainly due to increased number of melanin producing cells in this area and due to friction, sweat occlusion etc. Sometimes it may be a sequelae of fungal infection or any other skin condition( known as post inflammatory hyperpigmentation) too. If your doctor says that its fungal infection then it should be treated with antifungal medicines like oral fluconazole weekly and topical application of clotrimazole cream.
Theoretically speaking chromohidrosis is not related with any infection but in clinical set up I would definitely advise patient to shave pubic hair, wear loose light colored cotton underclothes, use antibacterial soap like triclosan or cetrimide soap for bathing and dust the area with antifungal powder. If no response is achieved, it is better to reassure the patient that colored sweat in few people can be a physiological phenomenon.

Hope this helped.
Take care

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