Breaking out in hives for about 3 weeks now. On feet, hands, legs, back arms. About 40 hives total in 3 weeks. Should I worry? Whats best treatment?

Hives are common. and usually no cause can be found, at times follows a viral infection, if stays longer than 6 weeks, progress more, or you develop lip/lid swelling with difficulty breathing you want to see your doctor, who may may refer you to a specialist. Meanwhile, you can use OTC antihistamines as loratadine, cetirizine or fexofenadine, once daily regularly for a week or 2, if no improvement, c ur MD.