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The commonest cause would be urticaria which may occur with change in temperatures. You may have cholinergic urticaria from heat and cold.Use of antihistamines like Loratidine/Cetrizine and sedating antihistamines like Atarax will give a good response. The other cause would be autoimmune diseases which run in the family like Lupus/SLE/Scleroderma. You need to see a doctor/Dermatologist who can identify the problem. Some tests and investigations may be required,and advise specific treatment.