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.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.