My 6 week old baby has had this mark on the back of her arm since at least a couple weeks old. I'm not sure if she had it at birth because I didn't notice it and our pediatrician didn't notice it at her 2 week apt. She has another regular check up in a few weeks but I think I might call tomorrow about it. It doesn't seem to bother her at all and she has no reaction when I touch it, but I don't want it to be anything serious. I'm thinking it's some sort of birth mark like a salmon patch, port wine stain, strawberry hemangioma, etc but I wanted to see if anyone else had any ideas. Thanks!

**UPDATE: We went to the doctor's today and she said it's a strawberry hemangioma and may get darker/ more raised during the first year but should fade after that but it is basically just a birth mark.