Don't masterbate until you are healed.
Use moisturisers suitable for the genital area, like Diprobase, Doublebase or something similar.
Do not use soaps or shower gels on the genital area as this will dry it out even more. Wear cotton underwear.
When you are healed and start to masterbate again, use a genital lubricant like KY gel or similar.
where can i find those creams in america? seems like it's only in the UK
When you go to the pharmacy, ask the pharmacist for an emolient cream that can be used on the genital area. He should be able to help you.
Or your doctor can prescribe a moisturing emolient.
The creams that I mentioned, probaby come under a different brand name in America.