There are a number of factors that can cause this symptom, one of them is environmental. The leaves of the plant are rolling upwards and this new growth looks a bit leathery. That can be a reaction to plant stress. Interestingly this type of leaf curl can result from a spate of very moist cool weather or from uneven watering of this tomato,  Rolling leaves can be a way to conserve moisture.  Generally this isn't anything to worry about. 

There are also tomato leaf curl  symptoms caused by viruses and mites.   Whiteflies and broad mites are culprits and there would be little you could do other than prevention. Overall, the tomato looks healthy aside from that  new growth (which may be just a sucker that can be removed anyway.)

https://hgic.clemson.edu/factsheet/tomato-leaves-rolling/

Sue