There are many reasons for toddlers to have a few bumps behind their ears, such as eczema, insect bite dermatitis, contact dermatitis, folliculitis, prickly heat and other causes. 1. Eczema: Inflammatory skin reaction caused by internal and external stimuli, which may lead to several small bumps behind the ears of young children. 2. Insect bite dermatitis: Inflammatory skin reactions caused by mosquito bites can also lead to several small bumps behind the ears of young children. 3. Contact dermatitis: localized skin allergic reaction caused by contact with allergenic substances can also lead to several small bumps behind the ears of young children. 4. Folliculitis: local hair follicles are infected by external bacteria causing follicle congestion and inflammation, which can also lead to several small bumps behind the ears of young children. 5. prickly heat: indoor temperature is too high, the skin perspiration is not smooth, can also lead to the right ear behind the ear a few small bumps. There may be other reasons why a toddler has a few bumps behind the ear, and you need to go to the hospital in time to get checked out and get a clear picture of the cause.