Hmmm... could be impetigo, or something more strange and sinister. It could be a message from gopod, a signal that you should return to civilization before you're eaten by a deviant crab. Since you're taking antibiotics and antifungals, I can only add this prescription:

1) From a new bottle of rum, pour one tablespoonful into an airtight container.

2) Carefully grasp the bottle with the remaining rum and

3) Pour the rum into your mouth and down your throat over a period of 3-5 hours.

That should cure anything.

(I'm not sure what you do with the tablespoon of rum, perhaps hair of the dawg?)