Skin Brushing is fantastic BUT never to be done on a rash or infected area.
Your body cannot cope with too much toxins coming out. You need antioxydants: Vit A and E (oral supplement - cream is also an option). And you need zinc (if its itchy you need zinc).
Any cream to ease allergic reaction from the drugstore will help (most of them contain zinc) Make sure you also take zinc orally as prevention for long term treatment.