Jalapeno plant disease

Hi,
 
I'm just raising my first jalapeno plants and recently realized some strange patterns appearing on some of their leaves (see pic attached).
 
Can you tell please what are those patterns, whether it is something serious problem and how can I save my plants?
 
Thank you for your answers in advance.
98401.jpg

 
Regards
Izsak
 
 
And a fairly harmless pest at that.  Unless you've got a lot of the buggers, the damage looks far worse than it is.
 
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