Hey recently, I got rash behind my right ear which caused a small lump to form behind it (I have eczema and I get lumps behind ears every year some are painful so not worried about it).
However, a few days ago, I noticed that my right neck was slightly harder than the left one. So I spend hours and hours trying to check if I have lymph nodes.
Now what happened is that, whenever I close my mouth and forcefully try to exert air from my mouth, a bump/lump appears below the right chin and then disappears.
Any idea what it is?