Final answer:
White lesions that rub off can indicate autoimmune disorders such as psoriasis or eczema, or might be related to an allergic reaction identified by skin testing. More severe autoimmune conditions like systemic lupus erythematosus and multiple sclerosis also lead to tissue damage with a variety of symptoms. Accurate diagnosis should be sought from healthcare professionals.
Step-by-step explanation:
An autoimmune or allergy condition that results in white lesions that can be rubbed off could be related to a few different disorders. One autoimmune disorder that can cause skin lesions is psoriasis. Psoriasis is characterized by the development of itchy or sore patches of thick, red skin with silvery scales, typically found on the elbows, knees, scalp, back, face, palms, and feet. Eczema is another autoimmune reaction presenting as dry, itchy patches of skin that might resemble a rash. These conditions involve an immune response that mistakenly attacks the body's own cells, leading to the observable symptoms.
Other immune system-related diseases include systemic lupus erythematosus (SLE), which can manifest in various symptoms, including skin lesions. Furthermore, conditions like multiple sclerosis (MS) represent how the immune system can target the body's own tissues, in this case, the myelin in the central nervous system, leading to the formation of sclerotic tissue. In the context of allergies, skin testing can identify allergens responsible for reactions such as hives or eczema through a wheal and flare response.
For any specific diagnosis, it's essential to consult with healthcare professionals. They may carry out examinations and tests, including skin tests for allergies or blood tests for autoimmune markers, to get a clear understanding of the underlying cause of symptoms like white lesions that can be rubbed off.