Baby Foot Rash Baby Has A Rash After Being Outside?

Baby has a rash after being outside? - baby foot rash

Today and yesterday, my husband and I had all the children outside. He was so well made! But today we sit with the babies (the end of February) were born and your legs and feet can touch the grass. As I was preparing for bed, I noticed a strange rash on my baby's legs and feet. It is only 1.5 months so I have some cream on it and put it to bed. Do you think it could be an allergy to grass? I call the doctor tomorrow morning. Thank you!