Children with itchy bumps on the thighs may be caused by urticaria, contact dermatitis, folliculitis and other diseases. 1. Urticaria: Urticaria is a kind of edematous plaque that is limited to the skin and mucous membranes, accompanied by itching and other symptoms. If the child suffers from urticaria, it will lead to itchy bumps on the thighs, the cause of the disease and physical stimulation, food, drugs, mental stress and so on. 2. contact dermatitis: contact dermatitis is an inflammatory skin disease caused by skin contact with external sensitizing substances, manifested by erythema, papules, blisters and other changes, local itching and other discomforts, the causes of the disease include animal, plant, and chemical, and can appear on the thighs. 3. folliculitis: folliculitis is mainly caused by bacteria and other pathogens infected hair follicles, if the skin is traumatized, plucking hair, will increase the chances of suffering from folliculitis, localized red pimples, accompanied by itching, pain and other discomforts, can be found on the thighs. There are many reasons for the itchy bumps on children’s thighs, so it is recommended to take them to the doctor for a clear diagnosis.