Visited GP
Woke up quite early today and felt some aching in my left chest muscle.
Coughed a few times as there is an itchiness in my throat (dunno why). As I coughed, the skin at the place where the tubes used to be rised and fell. Like air got forced out of chest and got blocked by the skin.
End up the air went under and into the muscles around the area. Sounds of air bubbles breaking up can be felt when I press on the affected areas.
Sigh. Lucky it is normal.