Hi Zain,
i have already posted about my success story in the alternative and complementary medicine forum, so you may want to check the post called "20 year case of Eczema cured with St. John's Wort", if interested by what follows:
Scientific research results dating from Fall 2013 at the University of Michigan have uncovered the role of the bacteria Staphylococcus Aureus in allergic skin disease, which includes most varieties of atopic dermatitis. Certain strains of this bacteria carry a toxin called Delta, which causes the mast cells to degranulate, thereby liberating a lot of histamine in the skin. That would explain why people suffering from eczema have an uncontrollable urge to scratch themselves, since histamine liberated in the skin will cause severe itching, just like when one gets an insect bite.
According to research, 90% of people suffering from eczema have their wounded skin colonized by this bacteria. It is also known to be extremely resistant to most antibiotics, which is why antibiotic therapy is rarely an option. Since we can't easily post links on this forum, you may type "University of Michigan and Delta Toxin" in your favorite search engine and you should be able to access the full scientific article.
I cured myself from my severe case of eczema by taking St. John's Wort Extract, which is a very well known antidepressor, for cases of mild to moderate depression. However, its most studied molecule called Hyperforin, also happens to be a powerful natural antibiotic against Staphyloccoccus Aureus, particularly against its Methicillin resistant strain nicknamed MRSA. St. John's Wort has also been in use in folk medicine for over 2,000 years, to treat small wounds, burns and abrasions of the skin. I have read that it was the plant of choice to help the body heal from battle wounds during the middle ages. Again, all this information can be verified on serious scientific sites by typing the desired keywords in your favorite search engine.
There also have been a few small scale clinical trials that demonstrated the efficiency of a St. John's Wort cream against Eczema. However, I took a systemic oral treatment and would therefore not be able to personally recommend such cream. It is also also hard to obtain commercially.
If you believe that St. John's Wort may help your child, please also read about all the warnings concerning its potential side-effects and interactions with other medications. These side-effects are rare for most, but it is always best to be informed just in case. I personally did not suffer from any unpleasant side-effects, but each person is different, which is why being aware should always be high priority.
Best of luck!