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.
Nizoral, T/Sal, etc. are used to treat seborrheic dermatitis - which will make your scalp itchy. Solve the itch, solve your need to scratch/pick. For healing sores - that's in the realm of anything that helps skin heal - say Aloe or Vaseline. You might also look into tamanu oil or manuka oil.