Itchy red bumps on the body when it is cold or hot may be cold urticaria and cholinergic urticaria. In daily life, try to avoid cold air stimulation, avoid heat, if necessary, can take oral antihistamine medication.
1. Cold urticaria: It is mainly an allergic reaction caused by the stimulation of low temperature. Try to avoid the stimulation of low temperature in daily life, if the symptoms can not be relieved, you can take oral antihistamine medication, such as diclofenac tadine, levocetirizine and so on.
2. Cholinergic urticaria: Urticaria symptoms caused by heat, strenuous exercise or emotional excitement. In daily life, try to avoid the stimulation of the above situations, at the same time, oral antihistamine drugs, such as levocetirizine, cyproheptadine, ketotifen and so on.
Red bumps on the body itchy when cold or hot, it is recommended to go to the dermatology department. The drugs mentioned above need to be used under the guidance of a doctor.