Half a year after the surgery for onychomycosis, the toe hurts again and there is white pus, it may be suffering from onychomycosis again, purulent dactylitis, osteomyelitis and so on. 1. Re-emergence of onychomycosis: after six months of surgery for onychomycosis, onychomycosis again can lead to pain in the toes, white pus and other uncomfortable symptoms. 2. Purulent dactylitis: Purulent dactylitis can also lead to symptoms of swelling and pain in the toes, and with the development of the disease, the pus cavity can collapse on its own, which will lead to the symptom of white pus flow. 3. Osteomyelitis: especially chronic osteomyelitis, it can cause bone pain, rupture, pus flow and other uncomfortable symptoms, and may even appear hollow, dead bone symptoms. Six months after the surgery for onychomycosis, the toes hurt again and there is white pus may also be other reasons, please consult a doctor in time, diagnose the cause of the disease, and follow the doctor’s instructions for treatment.