Trim toenails straight across to your length just in-front of the end with the nail sulcus. Don't spherical off the corners as this might cause ingrown toenails. Fungal infections: These may cause your nail to thicken or extend, expanding the likelihood of it rising into your skin. Thickened Nails is https://www.theorthopaedicandpainpractice.com/what-is-an-ingrown-toenail/