Ring worm and tattoo

Katharine
About a month ago I got a small stick n poke tattoo on my arm and I've been wearing long sleeves every day to cover it.On Friday I got a small red ring on my arm and I thought it was just a scratch.It hasn't gone away and I looked it up and it's ring worm.I don't know how to tell my mom about that tattoo without her being upset so that then I can go to the doctor to get treated:-( any ideas how to tell her or are there at home remedies I can do to get rid of the ring worm so she doesn't have to find out about the tattoo