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.
There is some scientific evidence that capsicum might also help reduce painful tender points in people with fibromyalgia when used as a lotion or cream and applied to the skin. Although some people use capsicum lotion or cream for nerve pain related to HIV or AIDS, it does not seem to be effective for this use.