Aldehyde, Ketone, Carboxylic Acid Aldehyde: Aldehyde is an organic compound which contain formyl group. This functional group, in its structure R-CHO, consist of carboxyl centre bonded to R group and hydrogen.
1 Infections, bites and stings, infestations, chronic diseases, allergic reactions, sun exposure, and dry skin are among the numerous causes of itching.  Anti-itch creams and lotions containing camphor, menthol, phenol, pramoxine (Caladryl, Tronolane), diphenhydramine (Benadryl), or benzocaine can bring relief.
If itchy upper-back skin is caused by dry skin, moisturize the skin daily. Use moisturizer after getting out of the bath or shower to lock moisture in place. Taking an oral antihistamine and applying corticosteroid cream to skin on the upper back can reduce inflammation and itchiness, according to MayoClinic.com.