How long this been going on? Sounds weird.
Went on for 6 or 7 months the first time then happened again another time for another 2 or 3(?). We were sent to multiple doctors including allergists and things and nobody could find anything. Then one day we decided to try yet another in the area and they thought they knew what is was right off. With their course of treatment it disappeared relatively quick. The second time that practitioner had moved and we had to battle our way through the original band of quacks until someone relented and finally listened and it disappeared again and so far hasn’t returned.