There is no one reason for this issue. These are often seen as a symptom of some major underlying health issue like diabetes or obesity. Although this is not a major health concern in particular, some people maybe conscious about it for cosmetic reasons.
This darkening happens due to the rapid multiplication of pigment cells in the skin. The rate of multiplication is generally higher than the usual rate. One of the reasons that this happens is because of frequent hair removals. This disorder is also inherited by people from their ancestors and may also be racial. Some high dosage medications may also be the reason for this problem.
The treatment of it may some general measures or some particular ones as well. a skincare routines, like moisturizing and applying tropical creams on the affected areas may help lighten the darkness. Laser surgeries are also available for the issue. Some DIYs and homemade solutions like applying lemon juice, baking soda etc. is also beneficial.
Some other steps that can be taken to reduce the darkness are:
# Oral Medications: If the problem does not respond to tropical treatments,then some retinoid pills maybe suggested by the dermatologists. Although these drugs can cause major side effects and are not at all suggested for pregnant women.
# Weight loss: Sometimes obesity is the reason for this problem. In that case weight loss helps a lot in the reduction of darkness.
The conclusion to this is that though underarm darkening is not a major concer, getting checked once is always beneficial and advisable.
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