Small bumps on the back of your baby’s hands can be caused by atopic dermatitis, and in addition to atopic dermatitis, it can also be papular urticaria due to insect allergies. In either case, it is due to allergic factors. There are of course other factors that lead to this, such as fungal infections, which are symptoms of infected papules and pimples that occur when the epidermis is attacked by a fungus and planted on the epidermis. In addition, there is also a possibility that a kind of skin disease, namely sand dermatitis, occurs when babies often play with sand and water. If it is sand dermatitis, babies are advised to stop playing with sand and water, which may get better automatically. When HFMD is prevalent, it is also important to rule out HFMD virus infection as a cause.