Mold in toddlers shoes?

J

Is this mold in my toddlers shoes? He’s had a stubborn rash on his feet that I have not been able to get rid of and so I decided to pull apart his shoes to clean them. I took out the insoles and saw this and immediately felt awful!!!

He got them soaking wet on Christmas Day and it took forever for them dry. I never thought to take out the insoles to help them dry and now I’m afraid I’ve been exposing my baby’s feet to mold this whole time 😭😭😭😭