Bald patch under left wing on baby chick

[iab2305]

Hey everyone,
I just noticed a bald patch under my week old chicks wing. I checked for lice/mites but couldn't see any. She seems okay and interacts with the other chicks just fine. should i be concerned?

 

[raingarden]

Look pretty much normal to me.

 

[DobieLover]

It does not look concerning at all.