My 8th gen in same colour has it in same location only it's just starting. Get yourself a little tube of the tcut or carplan scratch remover and it'll clean off all that orange rust staining. That's all that orange stuff is, the rust is underneath the bubbled paint.
Then get one of those touch up kits from Halfords that has the lacquer included and paint some on the bubble spots making sure to go slightly over to the good surrounding area and seal it keeping the oxygen and water from getting to the metal underneath. This is a good method to slow it down considerably if not stop it getting worse until you can get round to tackling it to get it back to perfectly flat and painted