This problem frequently results from professional hazards, i.e. hair-dressers, carpenters, bakers, and photographers who come in contact with damaging products such as potassium permanganate, silver nitrate, abusive cosmetics (nail enamel containing many pigments), hair dyes, tobacco, etc. It can also be caused by general illness, mycosis infections, etc.
Avoid manipulating products that cause this colouring. However, if the nail colouring is caused by an illness, Mavala products do not have any solution. We suggest consulting a dermatologist for a complete diagnosis and recommended treatment.
However, you can still have a manicure. First use the protective base coat, Mavala 002 double-action, then two fine coats of Mini Color (preferably a dark shade), and finish with Colorfix so that your nail polish lasts longer.