Formula/milk allergy??

Mallarie 💙🐢 • Baby Boy arrived 2w early and arrived fast, less than 5hrs of labor all natural and not by choice, on 12/19/2015 💙🐢
His cheeks are rough, red, flaky. He has been on formula for a week but the last few days it has been full strength (no breast milk). It looks worse in person. He also spits up a lot but he's always done that...
Any other moms have babies with milk allergy reaction like this? Or could it be something else?