The edge of your big toe’s toenail hurts when you press on it may be a case of onychomycosis. Inguguinitis is a purulent bacterial infection of the skin along the sides of the nail where the nail groove and its surrounding tissues form. Causes of onychomycosis include puncture wounds, contusions, reverse peeling, or cutting the nail too deeply. Inguguinitis often first occurs under the skin of one side of the nail groove, and may present with localized redness, swelling, heat, and pain. After suppuration, pus spots may appear under the skin of the nail groove, and may even form a hemicyclic abscess or subungual abscess. When the infection is aggravated, there are often symptoms such as increased pain and fever. When the nail groove inflammation has not yet pus, you can use topical ichthyol ointment, gold powder and other drugs to treat. The use of drugs should be under the guidance of a doctor. Those with abscess formation should be treated surgically with incision and drainage, and those with nail root abscess need nail extraction. If you have any of the above symptoms, please seek medical advice promptly.