For a few years i have had a lump on the back of my ear, its very tiny. well one time it got bigger and red and it hurt. and then it just shrank back to the normal little lump again. my parents told me its nothing, but then the other day my friend told me he has a lump on his ear too!

the lump isn't where my ear is pierced, and its the same as my friends and he doesnt have his ears pierced at all so i know that it isnt from my ears being pierced. plz tell me what this is!