White spot on mint leaves

Hi everybody,

My mint has finally decided to bush out after much worry but the leaves have white spots on them.  I've had a quick inspection and can't see any infestation plus the basil and parsley pots look alright (i.e. no spots on them) and they are next to each other.

Here's an example I found of what it looks like: 

<img src='data:image/jpeg;base64,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