The most accurate way of recognizing blisters from an allergic reaction is to take note of their appearance and of what you were doing before they appeared. Most allergy-related blisters will develop in clusters, so if you have a single blister you may not be having an allergy reaction. Actual blisters and allergy-related blisters are also different in appearance. Blisters from an allergic reaction are also often accompanied by other symptoms.

One way to recognize blisters from an allergic reaction is that they usually form in groups or clusters. While most blisters form due to friction or injury to one particular area, such as from shoes rubbing the back of your heel, allergy-related blisters are not typically formed in response to an injury. Most times, you will notice several blisters formed in one area rather than just one solitary lesion.

The appearance of blisters from an allergic reaction may also be different from other forms. They often form directly over an area of skin that was exposed to an allergen. For instance, blisters that form in response to henna temporary tattoos typically only form directly over the painted area. If you have blisters that look different than most, you may have hives rather than blisters. These are bumps that appear on the skin and they resemble pimples, although they don’t usually have whiteheads.

If you notice blisters anywhere around your body and you know that you have recently used a new laundry detergent, soap, or lotion, there is a good chance you have blisters from an allergic reaction. This is one of the best ways to tell the difference between allergy blisters and others. Pay close attention to the products you use, and attempt to stop using anything you think may be causing a reaction.

Another way you can recognize blisters from an allergic reaction is by taking note of any other symptoms you may be having. Surrounding skin redness or dryness, itching, oozing, and general irritation are all signs of an allergic reaction. Sneezing, itchy and watery eyes, stuffy nose, and wheezing can also be signs. These will usually be short term and are not serious.

Occasionally signs of a severe allergic reaction may also occur. These can include wheezing, shortness of breath, dizziness, heaviness in the chest, nausea, and even fainting. Shock may also occur in very serious cases. If any of these symptoms appear before or shortly after blisters appear you may be experiencing anaphylactic shock and should see a doctor right away.