Hey guys - Having some bad luck this week. Just had one rat neutered today to remove a tumour. Now I've found something on his brother. I was petting Meemer this evening when I noticed a small hard lump on his side. It's a little smaller than a pea and is hard, with one end that feels almost angular/sharp. It moves with the skin and doesn't seem to be attached underneath. The skin over it looks slightly shiny with a red/yellow colouring underneath. Does this sound like it could be a cyst or an abscess? Or something more sinister?