Treatment of onychomycosis is not recommended during pregnancy. Because most of the nails are caused by dermatophyte infection, and most of them are secondary to tinea manus and pedis. Generally, there are no conscious symptoms, but only changes in the color and shape of the nails, so you can not rush to treat them. Moreover, during pregnancy, the use of drugs for treating onychomycosis may affect the growth and development of the fetus, so you can wait until after delivery to systematically apply drug treatment. If the symptoms of onychomycosis are serious and there are secondary infection symptoms accompanied by redness, swelling and pain, some drugs can be applied externally, such as compound phellodendron solution paint, iodine tincture, etc., which can effectively relieve the symptoms of redness, swelling and pain.