Severe itching from dressing, following carpal Tunnel surgery

Good evening, I had surgery today and I have severe itching/soreness in wrist. It was so bad I had to take the velband off. I have covered in sterile gauze and rewrapped with 2 crepe. My skin was quite red, I am concerned I may be allergic to the dressing but don't want to interfere with the dressing again. I have taken antihistamines but still very itchy. Please could you advise on the best course of action. Thankyou.