Baby hand swelling is common in the following cases: 1, mosquito bites, because the subcutaneous tissue is relatively loose by mosquito bites, local inflammatory changes, local redness and swelling, but generally not into a symmetrical position more in the unilateral hand at the same time accompanied by itching, you can locally wipe with iodine volts will disappear within 1-2 days. 2, allergies caused by the entire back of the hand is diffusely swollen and accompanied by a significant itch, sometimes accompanied by a generalized rash, 3, systemic diseases, when there is kidney disease or hypoproteinemia prone to edema, accompanied by the face and other parts of the body obvious puffiness. If necessary, oral anti-allergy medication can be taken. 3. Systemic diseases, when there are kidney diseases or hypoproteinemia, edema is likely to occur, accompanied by swelling of the face and other parts of the body, which requires prompt medical attention.