Talk to Dermatologist on Dark Spots On Hands

I applied hand wax on my hands and soon after i got itching on my hands, after two days i applied cone mehndi on my hands as i had to attend mehndi function, i got itching on my hands again, after a week i used to rub mehndi with my nails then after few days there was no itching but i got dark spots on my hands on those areas where i rubbed.