If it's mainly in the legs it may be plaque psoriasis, best to get a referral to a dermatologist as that's the only way to know for sure what's wrong

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A MyAutis...

Don't use Vaseline. With repeated use it causes the body to stop producing it's own natural oils in the area you are using it on and dries your skin.
Use either coconut oil or a pure Vit. E oil which works even better when you combine either one with a coconut butter or shea butter cream . That combo stops itching and heals the skin. Coconut oil, by itself, also does that. Allergies are usually the culprit, but stress is an even bigger factor and these kids are under a tremendous amount of stress. There is also a supplement called Herpanacine which works from the inside out and I have friends that tell me it works.

Bathing with soap can cause that. My son's doctor recommended we use Dove, lukewarm water oatmeal. It helped tremendously.

Regulation and attention... that is where we all continue to struggle...