Please try for better focus and post a new image.

In a pot?

If so,each one should be in its own.

Using any fertilizer?

If so what and how often?

What potting mixture did you use?

In a 5 gallon bucket....50% topsoil and 50% potting soil....mixed....brand top soil American Countryside... potting soil brand is Natural Organic. This plant is one of 12 tomato plants using exactly the same soil. They are 2 weeks out of transplant. I used Miricale Grow when I transplanted the plants. Yesterday I fertilized with Jobe's Organic Heirloom Tomato and Vegetable food.This is the ONLY plant showing these symptoms.