What do you recommend for pneumothorax?

Depends. If small, just observation .. If large and symptoms (shortness of breath or pain), may need catheter or tube to evacuate pneumothorax and reinflate the lung ...
Go to emergency. Pneumothorax occurs when air enters the space outside of the lung and the chest wall. It is due to a hole in the lining and causes the lung to collapse with dangerous lack of breathing. Some are spontaneous, others due to lung disease - occasionally severe. This needs immediate treatment.