Very severe early blight. The tomato has BER, the plant will outgrow that. Better get the copper spray going as soon as you trim off and bag up mist of those infected leaves. Use the WEAKEST recommended dose of copper in your spray, it will be plenty strong enough. Too strong will stunt new leaf growth and put you back 3 weeks delayed. If it looks blue on your leaves it is too strong. Be thorough under and over the leaves and all of the stem down to the soil line. Then every 7 days repeat as a preventive.
Epsom salts is magnesium sulfate, it doesn't have any calcium in it, it therefore won't help the BER. You can put in calcium nitrate(Calcinit), or just evenly water and wait for the plant to grow out of it, which it will.
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