### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
At my doctors appointment this week he observed what appears to be a large amount of histamine in my blood (I turned red very easily and it lasted awhile) and I also noticed I get red and hot randomly while indoors or out and it take awhile to cool down, I am a 33 year old female. He suggested Zyrtec at night but the next day after taking it I got red and itchy on my arm and other areas became uncomfortable like needing to continually crack my neck, back and mainly my two fingers on my right hand. The pharmacy suggested Benadryl but that did not help. Now it s been going on a few days, my itchy red fingers hat continually need to be cracked for relief were swollen and red this morning and very painful near the joint and continue to be painful although swelling went down a good bit throughout he day. Now I am becoming itchy in other areas like my left hand and my left ear is now bright red and very hot. I also suddenly have unexplained brushing across my lower back and right side. I am very worried, what could this be?

### output:

HI, Thanks for using Chat Doctor, Itching and redness all over body like fingers, arms,neck etc. and high levels of histamine in blood could be possibly an allergic reaction to something. You should consider the use of an anti histamine to dampen the response. An example would be levocetrizine or fexofenadine a good choice in place of Ben Chat Doctor. There are also some creams which may soothe the itching, examples include calamine lotion or menthol in aqueous cream. You need to be further clinically examined by dermatologist for proper diagnosis and treatment. I hope this helps,