Chinchilla: weird ear lump

Hi I just got my chinchilla about a month ago and a couple days ago I saw this lump on the end of her ear. I thought it was nothing and was just a little bit of dryness. It still isn't gone and tried to gently get it off but it won't budge. Does anyone know what it is?

Picture: https://gyazo.com/6291c72745f4aba6564207d81f5f44d3