Your hands are probably sunburnt if they have been exposed to intense sunlight. To avoid dryness, gently wash the region with cool water, apply a calming moisturiser or aloe vera gel, and drink lots of water. For a few days, stay out of the sun and wear sunscreen or cover your hands when you go outside. You can take paracetamol as prescribed by the manufacturer if you're in pain. If you experience significant redness, blisters, swelling, fever, or worsening pain, please consult a physician.