Can anyone help indicate the problem of my plant

Hi everyone,

A couple of days now I just saw a white dot on my plant. I'm a new grower first time can somebody tell me what it could be.
Thank you15902429778253822462212090994211.jpg
 

lime73

Weed Modifier
Did you spill nutes on it , did it touch a hot light, maybe rubbed against pot?
Doesnt look like a deficiency.
 
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