Pleco help

[Moby]

I’ve a Lemon pleco which I’ve had for a while .He seem healthy enough but I’ve just noticed a couple of black spots have appeared one on his head and one on his side.Any ideas?
Thks

 

[TwoTankAmin]

Please- always include pictures when asking this sort of question. If you want help, people need to see what you see. It is important pictures be clear.