My child has a blister on his tongue and red raised rash all over body. What could this be?

There are several possible causes for a child to have a blister on their tongue and a red raised rash all over their body. Some of the possible causes include:

1. Hand, Foot, and Mouth Disease (HFMD): This is a common childhood viral infection that can cause fever, sore throat, blisters in the mouth and on the hands and feet, and a red, itchy rash on the body.

2. Chickenpox: This is a highly contagious viral infection that causes an itchy, blistering rash, fever, headache, and fatigue. The rash typically starts on the face and chest and then spreads to the rest of the body.

3. Scarlet Fever: This is a bacterial infection that is caused by bacteria called Streptococcus pyogenes (group A streptococcus). It is characterized by a sore throat, fever, and a red, sandpaper-like rash that typically starts on the face and neck and then spreads to the rest of the body.

4. Allergic Reaction: A blister on the tongue and a red rash on the body could be signs of an allergic reaction. This can be caused by a variety of things, such as certain foods, medications, or insect bites/stings.

It's important to take your child to see a doctor if they have a blister on their tongue and a red rash on their body. The doctor can diagnose the cause and recommend the appropriate treatment.