Final answer:
Excessive dry, white flakes from the scalp may be due to dandruff or psoriasis, characterized by itchy patches with silvery scales. Dry hair, gingivitis, and other symptoms could indicate scurvy, which requires treating the underlying vitamin C deficiency.
Step-by-step explanation:
Excessive amounts of dry, white flakes from the scalp are often associated with dandruff. Dandruff can be a result of dry skin, sensitivity to hair products, or skin conditions such as seborrheic dermatitis. Another condition that can cause dry, scaly scalp skin is psoriasis, which can also present with itchy or sore patches of thick, red skin with silvery scales. This condition commonly affects the elbows, knees, scalp, back, face, palms, and feet. In contrast, symptoms such as dry hair, gingivitis, bleeding gums, dry and scaly skin, slow wound healing, easy bruising, and compromised immunity, could lead to a more systemic issue like scorbutus, also known as scurvy, which is a vitamin C deficiency. It's important to treat the underlying cause of these symptoms to improve scalp health and overall well-being.