1- excessive shaving , not using the right kind of shaving cream or razor to remove the hair can cause dark patches on the underarms.
,2- dark patches on the underarms can happen due to the growth of the dead skin cells that are hidden on the microscopic parts of the skin. (this is your case with dry armpits since dryness leads to dead cells)
3- Using antiperspirants and deodorants can cause dark patches on the underarms. Moreover, there are cases of skin discoloration because of the presence of certain ingredients in these products. Therefore, stopping the use of these products can help one get rid of the underarms’ dark patches
4-Another reason causing armpits’ dark patches is hyper-pigmentation which is a medical condition where the skin produces excess melanin than it should.
5-Acanthosis Nigricans:
This is a medical condition affecting various parts of the body such as the neck, underarms, etc. Moreover, people suffering from this disease can have brown and black markings on their body.
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