When a pregnant woman suffers from onychomycosis, it generally does not have adverse effects on the fetus. However, when treating onychomycosis with medications, some drugs, especially antifungal drugs, can have a significant impact on the growth and development of the fetus. For pregnant women, onychomycosis mainly causes transmission and infection, and affects the appearance of the nails. In early pregnancy, it is generally not recommended to start treatment with medications. If treatment with medications is necessary, it must be done under the guidance of a doctor, and drugs that do not affect the fetus should be chosen. (The use of medications should be under the guidance of a professional doctor.)