The pale and slightly hard skin on your knuckles is unlikely to be caused by squatting during meals or while performing Namaz. This change in skin could be related to other factors such as pressure, mild circulation changes, or a skin condition possibly influenced by your allergy history.

🩺 Possible Causes

• Repeated pressure or friction on knuckles during squatting might cause mild skin thickening but usually not paleness.
• Allergic reactions or contact dermatitis related to your sulphur allergy could affect skin texture and color.
• Circulatory issues or early signs of skin conditions like eczema or psoriasis might cause these symptoms.

🩺 What You Should Do

• Avoid any irritants or allergens you know, including sulphur-containing products.
• Keep the skin moisturized and protected from excessive pressure or friction.
• Monitor for any progression such as increased hardness, pain, color changes, or other symptoms.

🩺 When to See a Doctor

• If the skin changes worsen, become painful, or spread.
• If you develop other symptoms like swelling, itching, or blistering.
• For a precise diagnosis and treatment, consult a dermatologist who can examine your skin and possibly perform tests.

If you want, I can explain more about skin changes related to allergies or pressure.To narrow down potential causes, we will need some more information.I understand you're concerned about the skin changes on your knuckles. Could you please provide your age and gender?