She is 25 yrs old having dark armpit and rest area near armpit is normal color which looks very odd. She tried lemon ,baking soda and potatoes but no diffrence.she keeps underarm clean and always do hot wax to remove dead cells but still it is dark and sometimes due to excess sweating underarm stinks. All home remedies is not working at all and also waxing is of no help Pplease let me know for any permanent solution for this .