The Cnemidocopte pilae mite ("scaly leg and face mite") is the most common of the "bugs" of parakeets who develop proliferative crusty, exuberant growths on the beak, cere, face, legs, the margin of the vent and on the wing tips. A characteristic "honey-combed" appearance is due to the mite tunnneling through the keratin - a structural protein of the skin. Nutritional imbalances are a common cause of drying of the skin andresultant pruritic (itchiness). Hypovitaminosis A (a lack of vitamin A in the diet) is most likely. What have you been feeding Trumpet and Maxie, please?
Seeds should compose less than 20% of their diet. A diet of mainly seed and nuts has excessive fat, carbohydrates, and phosphorus; marginal protein; adequate vitamin E, and are deficient in amino acids, calcium, available phosphorus, sodium, manganese, zinc, iron, vitamins A, D3 (necessary for efficient absorption of calcium), K, and B12, riboflavin, pantothenic acid, choline, and available niacin. Ideally, a balanced pelleted diet such as can be found here: www.harrisonsbirdfoods.com or here: www.lafeber.com/pet-birds should be fed as well as hard boiled egg yolk, pancakes and cornbread, the tops of fresh greens, dairy products such as yogurt and cheese, fresh fruits such as apples, pears, melon, kiwi, and berries, vegetables such as broccoli, carrots, beets, asparagus, cabbage, sweet potato, and squash, and even tiny pieces of meat.