Portland Naturoapthic And Homeopathic Whole Family Health Clinic. Portland, Oregons Naturopathic Doctor: Holly Zapf, ND, DHANP Naturopathic Physician, Board Cretified in Homeopathy Home Meet Dr. Zapf adn Staff Contact Us ... The fnugus does not cause pain, but the thikcness and shape can cause excess pressure and discomfort and at times lead to inrgown nails and bacterial infection. In diabteics, fungal toenails can lead to ulceration under the nail. ...