Skin Desinfection has to be done AFTER marking,using garzes 10x10 cm not sterile impregnated with chlorexhidine WITHOUT ALCOHOL on the marked area without erasing the drawing.
Lingettes may be more practical .
If you use any desinfectant containing primary or secondary alcohols., you may get hyperpigmented spots which may disappear without treatment after 3 weeks.
Iodine is very aggressive for the skin and may cause some skins pathologies.
Any product containing arachides in contact with the skin may cause severe allergies..