Just yesterday a few hours after I took a shower my body became incredibly itchy basically everywhere (legs, arms, back, scalp etc.) but has been particularly bad on my chest. I tried to think of anything different that I may have used or eaten and I figured it's probably my new body wash. Upon investigating I realized the body wash has red #33 and #4 dyes in it, the body wash I used previously had no dyes. I was wondering if this was possibly a red dye sensitivity or allergy or if this new body wash maybe isn't as gentle? The new body wash is Skin So Soft Signature Silk I believe. I haven't had any problems with red dye in foods or medication that I've noticed.
oral antihistamine, such as Benadryl or Claritin can be used. If the symptoms persist then get an evaluation done from a dermatologist as topical and oral steroids may be needed after confirming the diagnosis.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.