Postpartum toenail cover rot, clinically usually considered as onychomycosis, which is associated with fungal infection, need to be treated with topical itraconazole and other antifungal drugs under the guidance of a doctor. Nail fungus is also commonly known as gray nails, which refers to nail lesions caused by dermatophytes that invade the nail plate and the nail underneath, and clinically common dermatophytes include Trichophyton rubrum, Candida, and Trichophyton mustafasciatum, etc. These dermatophytes can invade the nails after they have been damaged, and they can also invade the nails after they have been damaged. After invading the nails, these fungi can release various enzymes to decompose the nail plate, thus causing damage to the nail plate structure, with clinical manifestations of nail plate atrophy, discoloration, detachment, separation and so on. Clinical usually external antifungal drugs, such as terbinafine, itraconazole, etc., if the situation is more serious, but also need to increase the oral dosage form of the above antifungal drugs. Note that antifungal drugs are generally used with caution during pregnancy and breastfeeding, and medication should be used in accordance with medical advice. Suffering from onychomycosis, it is recommended to go to the hospital in a timely manner, after clarifying the cause of the disease, under the guidance of the doctor symptomatic treatment, do not self-medication.