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.
Homeopathic Medicines for skin rashes. Sulphur, I find, is ideal for redness and rashes that aggravate at night.Homeopathic medicine Medoohinum is suited for treating the fiery red rash around the anus in babies. Lithium Carb works best in case of a rough rash all over the body and tough, dry, itchy skin.