Papular Urticaria Here from fleas.
Allergic contact dermatitis. Linear vesicles from allergic contact dermatitis to Rhus (poison ivy).
Eczema herpeticum In this photos, the vesicles have mostly ruptured.
Scabies. Vesicles are not a regular feature of scabies, but may occur.
Miliaria crystalina This typically occurs in an infant.