When it's hot, I feel blocked in my chest after eating betel nut! Then these red spots grew on the chest! What to do!

From your description, there are many reasons, which may be myocardial ischemia, obstructive pulmonary disease and so on. From the perspective of Chinese medicine, it may be a lack of heart. In your case,

Guiding opinions:

I suggest you go to the local regular hospital for an electrocardiogram, chest X-ray, blood routine, blood oxygen concentration, lung function, heart function and so on. In treatment, if there is myocardial ischemia, you can try Danshen Dripping Pills, and if there is insufficient heart-qi, you can try Tianwang Buxin Pills.