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This seems like urticaria.
Urticaria is condition which is thought to be caused by an over active immune system.In response to some allergen the immune system gets activated.This causes the mast cells to release histamine which causes leakage of fluid from capillaries causing appearance of hives.
In most cases the triggering factor remains unknown and the condition is called idiopathic urticaria.
Urticaria may be related to thyroid disorders and as you have history of thyroid disorders you need to have yourself checked up for thyroid as well.
You should see your doctor for an initial examination and if your doctor feels necessary a referral to an immunologist.
Meanwhile you should continue using anti allergic medicine.If condition does not improve with anti allergic, a short course of oral steroids may be prescribed by your doctor.
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