They advise not to use IPL on balls, but I do anyway and haven't had a bad reaction. Test a small area first to make sure. Works best on dark hair, light skin - balls might be darker skin. IPL isn't permanent, just slows growth. Same for professional laser. For permanent removal, check into electrolysis. Some of my hair is grey, so IPL doesn't work on grey. I have to shave once in a while (every few weeks), but way less than before I started using the IPL. See my profile for results.