Galaxy Watch 5 burning skin?

Has anyone else experienced a Galaxy Watch (mine is 5 with LTE) sensor burning skin?

I had my first ever Galaxy Watch delivered last week and have been moderately using it since then. Last morning I found a blister under the watch right after I woke up. Prior to this, I had used an economic wrist band for over 4 years and have had no problem at all, even though it had a sensor to calculate various health points too. I wasn't expecting something like this from a best of the line watch from Samsung.

And this is when, the watch was in "Power Saving" mode the whole night, had Heart Rate monitoring enabled every 10 minutes, Stress disabled (manual), and Blood oxyzen during sleep disabled. The watch was connected to phone, and was in DND mode.

This and the extremely low battery life makes this watch so undesired and am thinking if I shall keep it or return it.