Are?eczema or?skin rashes common in toddlers?

Yes: Definitely. Atopic dermatitis started in infancy is more noticed on the outer surface of extremities in toddlers. They often develop various viral infections presenting as febrile illness with rash as well.

All age groups: Most often eczema has an onset before 5 years of age but it can occur at any age. Presentation and location of eczema can differ depending on age of onset. Slightly more common in females. A lot of children who had eczema will find that as they get older their eczema gets less severe. Some adults "grow out of" their eczema entirely.