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Dermatology Community
This forum is for questions regarding Dermatology issues, such as: skin rashes, acne, birthmarks, skin infections, rosacea, and general skin care.
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These are not dirt deposits but areas of hyperkeratosis/hyperpigmentation or if associated with itching/burning sensations could be a fungal infection of the skin folds.
Hyperkeratosis is a thickening of the skin, hyperpigmentation accompanies this type of hyperkeratosis.
Most treatments are aimed at softening the keratin and removing the thickened skin. This may be accomplished with topical creams that contain as the active ingredient salicylic acid, alpha-hydroxy acid (lactic or glycolic acid), urea, or tretinoin.
For the discoloration that often accompanies the hyperkeratosis, skin lightening creams may also be used like Hydroqinone 2-4%.
ref:http://www.brownskin.net/hyperkeratosis.html
If it is a fungal infection then application of OTC anti-fungal creams/ointments can be used to treat it.