The appearance of blisters is a big nuisance. Usually they are accompanied by itching, pain, burning, and improper handling or scratching can cause infection, suppuration or scarring.
Before answering the question why skin blisters itch and hurt, you need to understand the terminology. A blister is an education without an internal cavity, which appears due to the acute inflammatory edema of the papillary dermis. Blisters, as a rule, last only a few hours, after which they disappear without a trace. The shape of the wheal can be round or irregular; they are dense to the touch, pinkish, rise above the rest of the skin.
It is important to distinguish blisters from papules, pustules, roseol, skin calluses and blisters that occur after a burn. In this article we will talk about blisters that appear on the body after insect bites, or in response to the action of allergens.
Short list of causes of blistering
Scaly painful blisters, swelling and redness can be a signal of more than a hundred different diseases. We list the most common reasons, starting with simple and obvious.
Insect bites – microtrauma, instantly provoking an allergic reaction. Alien toxic components, getting under human skin, cause swelling and redness of the skin. Blisters after bites can have very different sizes, and their color varies from yellowish to red. Among the potentially dangerous insects are mosquitoes, flies, gadflies, bedbugs, midges, ticks, bees, wasps, bumblebees and hornets.
Plant burns can also cause itchy blisters. In our latitudes, you have the most chances to stumble upon nettles. When the skin comes into contact with the leaves and stems of this plant, characteristic pink rashes of various sizes and shapes appear. If a person does not have an allergy to nettle, there is nothing to be afraid of: after a while the blisters will pass, leaving no trace behind. But severe burns with young nettle can hurt for quite a long time (several hours), so it is recommended to smear the skin with ice and take an antihistamine.
Urticaria is an allergic dermatitis, which got its name due to the external similarity with blisters from stinging nettle. Nettle rashes can occur as an independent symptom (in response to allergens, high or low temperature), and against the background of any disease.
Mycosis is a parasitic fungal disease that affects internal organs and skin. One of the symptoms of mycosis is pink blisters of irregular shape, the surface of which begins to peel off over time.
Neurodermatitis is a chronic inflammatory disease of the skin, provoked by metabolic diseases, internal organs and the nervous system. Strongly itchy blisters all over the body – the main symptom of this disease. Neurodermatitis is exacerbated in the autumn-winter period, as well as after past infectious diseases, when the immune system is weakened.
Sometimes blisters similar to urticaria can be caused by endocrine system diseases (diabetes mellitus, hypothyroidism, thyroiditis), infections of bacterial, viral and fungal nature, tumors of the liver, ovaries, rectum or colon, rheumatoid arthritis and other serious pathologies. If the blisters on the skin do not pass longer than one day – contact your dermatologist immediately.