Hi I Am A Female I Had A Burn In

Hi I am a female I had a burn in my right thump and thin got infected thin it took a long time to hiel with a lot of courtzon and a lot of creams after my nail seeme to get detach and Chang color under nice I saw a dr but all what he said he Dosen't know what it is because I clip it my nail so much he said it might be tinya and give me forgers cream 2% and said see me again in six month I bought a lot of foot fungus stuff but my nail grow good thin deattct again and change color again what can I do