Minibel tomato-purple ish dot leaf?
hello i have planted the minibel tomato plant for around one month in door and it is already flowering but i notice a while ago all three of the my has purpleish dot on the lower leaf(see pic) is that a problem? should i worry?

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If all the other leaves are healthy then I wouldn't worry about it - I remove the lower leaves of my tomatoes anyway so that they don't pick up stuff from the soil if they get splashed while watering, so I'd take them off if I were you.
If more leaves were discoloured I'd be looking at a nutrient deficiency or overwatering, but with yours it's probably because those are the oldest leaves and they're on the way out anway.