Itchy bumps on the neck of the feet may be contact dermatitis, insect bite dermatitis, neurodermatitis and so on. 1. Contact dermatitis: after the skin comes into contact with some kind of irritating substance, such as paint or a certain kind of plant, this condition will have an inflammatory reaction, causing erythema, itchiness, mild edema, and pinpoint-sized dense pimples. 2. Insect bite dermatitis: the bite of some kind of insect, such as mosquitoes, bedbugs, fleas, etc., this situation will produce the skin will produce an allergic reaction to the secretion of the insect, the appearance of fusiform, bright red doughnut-like damage, usually occurring in the summer. 3. Neurodermatitis: this is a result of the influence of mental factors and often scratching or chronic friction caused by a chronic inflammatory skin disease, in which disseminated neurodermatitis, rash high in the trunk, limbs and other parts of the self-conscious paroxysmal intense itching. Itchy pimples on the neck of the feet can not directly diagnose the disease, there are other diseases may, should go to the hospital for examination, combined with the results of the comprehensive diagnosis and treatment.