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.
Rosemary essential oil also help heal rough patches of skin and reduces the scaly appearance characteristic of dermatitis, eczema, and psoriasis. If you want to prevent the possibility of itchy bug bites, rosemary essential oil is a great alternative insect repellant. 10) Patchouli. Help stop the itch with this earthy essential oil.