Dermatology Questions? Ask an Online Dermatologist.
Welcome and Thank you for your query posted.
My name is***** and being a Skin, Hair and Nail specialist I would be able to provide you with an appropriate solution to your concern.
Please note that my Goal is to provide you with an Excellent Service .
Before I answer your question I would like to get some more information:
Do you have history of Diabetes?
Please note that the answer provided is for information purpose only and does not substitute a Doctor - Patient Consultation in Clinic
Do you have history of fungal infection in the area in the past before the appearance of the black marks?
Are you obese?
Have you heard of the word erythrasma?
We have seen a few cases that do cause change in the skin color in this uniform pattern resulting in the color change.
They need to be confirmed by Wood's lamp.
Do you have access to Wood's lamp?
Do you have access to ointment called Fucidin?
I believe that it is Erythrasma which is a condition called by Corynebacterium and this bacteria releases an acid that causes color change in the area in a very uniform pattern as can be seen.
This cream can be got from the medical pharmacy or can even be got from your family doctor and is the treatment of choice for this condition and should be applied twice a day on the are for 2 weeks.
The Wood's lamp is an instrument that uses ultraviolet light as a diagnostic approach for this condition.
This condition commonly occurs in covered areas like the groin area .
This color change is definitely not a sign of malignancy or anything sinister or any other condition.
The color change reverses back to normal once the bacteria area eliminated from the area.
Please do get back to me in case of any further queries.