Every PMU is also a tattoo and therefore the rules of tattoo removal are the same as those for permanent makeup removal. But there also exists some differences. One is that for PMU much less ink is usually used than in a traditional tattoo and therefore we also use a much gentler quality of removal liquid for removal than is used for normal tattoo removals. However if there has already been different correction colours some PMU might have several layers of colour one on top of the other.
It is not recommended to cover or correct unwanted PMU/cosmetic tattooing with a skin-coloured ink as the rising quantity of ink accumulates in the dermis of the eye brows. It will not make the PMU invisible which is the original intention, as your natural skin colour also changes during sporting activities, individual disposition and according to the seasons. The so-called skin colour will therefore become noticeable as your own skin colour changes too, this is certainly not desirable from an aesthetic point of view.
Skinial permanent makeup removal removes unwanted tattoo pigments or the whole PMU/cosmetic tattoo completely out of the skin. Normally, the color disappears completely in the area that has been treated after one single treatment. In rare cases, for example when many colors have been tattooed due to covering or some rare medical indications, it might be necessary to treat the area more than once.