The skin of the underarms and neck can sometimes darken or become discoloured. Underarm skin that's darker than the rest of the skin can be a distressing problem for most of us. It keeps us from wearing sleeveless clothes.
What are the causes of dark underarms and neck?
Chemical irritants in deodorants and antiperspirants
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Shaving
The accumulation of dead skin cells
Friction caused by tight clothes
Hyperpigmentation such as an increase in melanin
Acanthosisnigricans , a skin pigmentation disorder that's associated with diabetes, obesity , and abnormal hormone levels.
Smoking,