Most effective: Large, flat areas like the arms and legs. Least effective: Curved areas love the underarms, and may even cause significant trauma to the face additional thin skinned areas. Are nonetheless in high school? If you are, look at your school district's website. Proper drainage . http://polimentosroberto.com.br/index.php?option=com_k2&view=itemlist&task=user&id=4323696