@Carolyn, so you've been through this, hence your bingo on aberrant Early Blight
If that's the case, is this from the potting mix? Can I treat it? Why would the plants "heal" when they get transplanted outside, because of the sun? is it from bunching together 20 plants ? Sorry too many questions trying to understand.
What can i do to avoid this ? Starting seeds earlier won't give me any advantages because they will barely survive until transplant.