rash around joint areas

I have had a rash that started as dots not itchy either, now they are full rashes with welts and are very itchy. The rash only occurs around my joints.  I has been 10 months now. I have had every blood work done and all if fine.cbs, ana, lyme,cu index..etc.  Any ideas of what it may be? Please help, I can't it anymore.  thanks

[Dr_Aparna]

Hi,
This seems to be an allergic rash.Since all your blood counts are normal it is nothing to worry about at present.
Hives are red, itchy welts or swellings on the skin that often come in clusters.Although hives can be highly uncomfortable to have, they are relatively harmless. Hives usually appear suddenly and go away on their own in a matter of days, hours, or even minutes.
Hives are often caused by a hypersensitivity to foods (commonly eggs, shellfish, nuts, berries, dyes, or other additives) and drugs.  Other potential triggers include physical exertion or exercise, stress, illness, chemicals, cosmetics, textiles, and pressure from materials rubbing against the skin.
ref:http://www.myonlinewellness.com/topic/hivestreatment#s22
Which part of the body will react and the severity of the reaction is genetically determined.
You can take an anti-histamine like Loratidine for the itching.Also apply Calamine lotion to tthe rash area to soothe the skin.
Unfortunately this is a recurrent problem.