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.
Aloe Vera can soothe and heal the itchy lesions that may occur on the face. Use aloe Vera directly from the plant for maximum results. To use aloe Vera to treat psoriasis on the face, wash the affected area with mild cleanser, one indicated for sensitive skin. Apply the aloe Vera gel at a minimum of two times per day. The recommended application to treat psoriasis is four times per day.