What is this dark patch on my wrist?

You are likely experiencing a heat rash and chafing in your private areas. This usually happens because perspiration becomes trapped against the skin thereby irritating. Signs may include redness, itching, and sometimes little bumps. To assist with this, tighten any loose-fitting clothes, stay cool, and ensure it’s dry down there. Apply some soothing ointment and be sure to take breaks if possible.

This can happen from things such as stress, poor diet, or using harsh hair products. To grow your hair and make it silky again, try eating a well-rounded diet full of fruits and vegetables along with drinking plenty of water. Also, use gentle sulfate-free shampoos, conditioners, and other styling products on your locks. 

You might have got ringworm on your hips. Ringworm is a fungal infection that can cause a problem on the skin. People with diabetes are at risk of getting it. Symptoms consist of patches on your skin that are red, itchy, and scaly. To treat it, you can use antifungal creams or ointments, but it's important to keep your blood sugar levels in check to help your body fight the infection.

Your symptoms sound like athlete’s foot and toenail fungus. An athlete’s foot can cause your nails to turn yellow, make the skin on your feet peel off, and make your toes hurt. The fungus that leads to athlete’s foot loves warm, damp areas – like sweaty feet. You can use over-the-counter antifungal creams on your skin and nails to treat it. Also, try to keep your feet clean and dry so they are less appealing to the fungus.

I understand you're dealing with skin itching. Itching can occur when your skin becomes dry and rough, often due to not drinking enough water, using harsh soaps, or cold weather. To manage it, make sure to drink plenty of water, apply moisturizer gently, and avoid harsh soaps. Also, protect your skin from the cold by wearing gloves and scarves.