Could a single tiny blister on forearm and then crop of small blisters that itch burn sting be anything other than shingles?

While shingles is a common cause of blisters on the forearm that itch and burn, other conditions can cause similar symptoms. Some other possible causes include:

Allergic reactions: Certain allergens, such as those found in poison ivy, oak, and sumac, can cause blisters that itch and burn. These typically appear in a linear or streaked pattern and are accompanied by redness and swelling.

Impetigo: Impetigo is a bacterial skin infection that often starts as small red spots that quickly turn into blisters. These blisters can itch and burn, and they may spread if not treated.

Chickenpox: Chickenpox is a common childhood viral infection that causes itchy, burning blisters all over the body. The blisters typically start on the trunk and then spread to the face, arms, and legs.

Hand, foot, and mouth disease: Hand, foot, and mouth disease is a viral infection that affects young children. It causes blisters on the hands, feet, and mouth that can itch and burn.

Dermatitis herpetiformis: Dermatitis herpetiformis is a rare skin condition that causes itchy, burning blisters on the elbows, knees, buttocks, and lower back. It is often associated with celiac disease.

If you are not sure what is causing the blisters on your forearm, it is important to see a doctor for a diagnosis. This is especially important if the blisters are accompanied by other symptoms, such as fever, headache, or body aches.