Bitten 2 days ago on palm of her hand behind thumb and is now red swollen and painful to move her thumb she is also extremely irritable with scratchy?

Needs to be seen: Bites can lead to cellulitis - an infection of the skin. If the bite was deep, like a puncture wound by a cat, there is concern for a deeper infection. Deep infections may require urgent/emergent antibiotics and sometimes even surgery. If there is spreading redness, inability to move the joint, or worsening swelling - I recommend being seen immediately.

Things to watch : Look out for symptoms like fever, lethargy (lack of energy), lack of appetite, exaggerated swelling of the finger (sausage digit), blistering and red streaking up the arm towards the wrist. Both the bite itself and subsequent scratching of the itch can introduce bacteria into the area. Any of the above symptoms would warrant a trip to the doctor.

Serious: Hand infections from any type of bite are serious and warrant the prompt evaluation and treatment by, preferably, a hand surgeon. Take the patient to the hospital emergency room where prompt treatment and availability of a hand specialist,if deemed advisable, can be arranged.