they are lesions characterized by the collection of clear liquid (serous or serum-haematic), which arise under the outer layer of the epidermis. With respect to the cutaneous plane, these signs appear evident and have variable dimensions between 5 and 10 mm in diameter.The skin appears as a thin tissue, covered with hair and small imperfections.In reality, this is composed of three main layers, each of which performs different functions and, in turn, are divided into further zones:
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The causes of blisters on the skin are numerous and include severe sunburn, exposure to extreme cold, intense friction or rubbing. The skin can react with the formation of bullous lesions even following contact with allergens or irritants (allergy or irritant contact dermatitis). The appearance of blisters on the skin can also occur in patients with autoimmune diseases (such as pemphigus vulgaris), acne and various infections (including chicken pox, shingles and impetigo).
Bullous lesions can be associated with other symptoms, such as pain, redness, or itching.
Treatment depends on the triggering cause and may include various strategies to facilitate healing and prevent the onset of infectious complications.
), regulates the body temperature, promotes the absorption of important substances, etc.- Epidermis (most superficial layer): it is the external scaffolding of the skin and there are the germinative cells, responsible for the production of all skin components;
- Dermis (middle part): it is made up of connective, soft and elastic tissue. The dermis is crossed by capillaries, lymphatic vessels and nerve receptors (papillary layer). Furthermore, this portion allows the skin to remain elastic and taut, allowing adequate protection of the whole body (reticular layer);
- Hypodermis or subcutis (innermost layer): connects the dermis and epidermis to the internal tissues, allowing anchoring on muscles and bones and supporting the adherence of the skin during body movements.
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