Hi my little girl as small blister like sores on her hands but it has a pussy dot in and she has them under her arms and behind her ear it itches alot?

Skin infections. Pus filled bumps on the skin are usually the symptom of a skin infection. When they become red, warm to touch and painful it is called cellulitis. Treatment of this includes oral antibiotics and occassionally drainage. See your doctor, because resistant infections are becoming more common and require special treatment.