Rice, although it still contains lectins that can do the same harm that gluten does. Just not so much. And it's they glycemic impact of the meal that matters. Not each food. It it with fat and protein and low glycemic veggies.
Also, what's good for an acne patient is what's good for human beings.
Actually, the harmful lectins and anti-nutrients are in the bran of the rice husk.
Generally acne patients tent to adopt a low carbohydrate diet, which is clincally documented to cause reduced thyroid function in long-term studies. Glucose is necessary for the conversion of T4 to T3 in the liver. Also, documented is the widespread use of dietary carbohydrates as the basis of most diets in the world, AND low prevalence of acne. Two of the largest staples in the world's diet are wheat, and white rice. I think what's good for human beings is still yet to be wholly determined.