Yes, that looks like edema. Good catch.
As you may have figured out already, treatment involves allowing for higher water transpiration in leaves (higher temperature, lower humidity, more ventilation) and lower water retention in the soil (decrease watering, improve drainage, change soil if waterlogged). Keep the leaves dry if possible, water in the morning, watch out for pests and mites for as long as the symptoms persist, and avoid spraying chemicals in the leaves for a while.