Hi, I can understand your concern for the itchy rash on back of neck and fingers. I can make a possibility of Allergic dermatitis. In Allergic dermatitis there are eruptions along with moderate itching and in more aggravated cases there is appearance of more redness which persist for more than multiple of days. The only precaution you must follow is not to touch, pinch pop or squeeze any of them other wise it can get infected and can cause complications. You can apply medium potency steroid cream application of fluticasone cream. You can additionally take antihistamine benadryl or loratadine by mouth. Go for your routine blood test and check for any abnormality in hemoglobin level and thyroid status Take care.