Your skin condition must be examined by a doctor, preferably a dermatologist, in order to make a differential diagnosis. There are so many different skin conditions and symptoms related to them. A doctor will be able to diagnose and treat you after examination and probably blood work as well. This could be allergy related, arthritis related, or nerve related. Please make an appointment with you doctor as soon as possible.
Thank you for the extra information. Did you do gardening recently, particularly with thorny bushes or plants? Blistering of the skin and sloughing can leave the lesions open to infection. I recommend that you see a dermatologist as soon as possible. Ask him to swab and culture the lesions for fungus and bacteria, and then the appropriate medication can be prescribed.