You do not give your son's age. It is difficult for me to be sure about these blisters without being able to see your son.Children can have this kind of blister with chicken pox and also in particular with a viral illness called Hand-Foot and Mouth Disease. Please ask your doctor to see your son.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.