Can someone help plse

Im a FTM my baby has idk how to explain its like a dry spot under her eye i honeslty don't know how it happend. But can anyone tell me what it could be. Shes been like that for almost 2 weeks idk if it has to do because i bought her a new shampoo (Jhonson n Johnson) she has alwayd used the same brand since born except it was the purple bottle. She finished it so thats why I bought her a new one which was the yellow bottle same brand also lotion. I do lotion her body when we go out and after a bath but I mean if that was the case shouldn't it be all over her body not just her undereye? Can it be cause of this hot weather i just don't know honestly it doesn't hurt her. I just cant think of how it happened ughh 😟😫 shes 8mo should i take her with her pediatrician