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Actinic keratosis (AK), sometimes called solar keratosis or senile keratosis, [1] [2] is a pre-cancerous [3] area of thick, scaly, or crusty skin. [4] [5] Actinic keratosis is a disorder of epidermal keratinocytes that is induced by ultraviolet (UV) light exposure ().
A seborrheic keratosis is a non-cancerous skin tumour that originates from cells, namely keratinocytes, in the outer layer of the skin called the epidermis. Like liver spots, seborrheic keratoses are seen more often as people age. [4] The tumours (also called lesions) appear in various colours, from light tan to black.
Pages and images are contributed and reviewed by health professionals from countries including the United States, the United Kingdom, Australia, Canada, and New Zealand. [6] The website also provides online medical courses for the continuing education of dermatologists. In 2017, DermNet released its first book, Dermatology Made Easy. [7]
The skin weighs an average of four kilograms, covers an area of two square metres, and is made of three distinct layers: the epidermis, dermis, and subcutaneous tissue. [1] The two main types of human skin are: glabrous skin, the hairless skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. [3]
Atopic dermatitis (AD), also known as atopic eczema, is a long-term type of inflammation of the skin. [2] AD is also often called simply eczema but the same term is also used to refer to dermatitis, the larger group of skin conditions.
Comparative dermatology is a branch of dermatology that examines skin disorders across species, focusing on similarities and differences between humans and animals, such as dogs. This interdisciplinary approach is crucial for enhancing our understanding of dermatological conditions and developing more effective treatment and prevention strategies.
Seborrhoeic dermatitis (also spelt seborrheic dermatitis in American English) is a long-term skin disorder. [4] Symptoms include flaky, scaly, greasy, and occasionally itchy and inflamed skin. [2] [3] Areas of the skin rich in oil-producing glands are often affected including the scalp, face, and chest. [4]
Skin grafts and local skin flaps are by far more common than the other listed choices. Skin grafting is patching of a defect with skin that is removed from another site in the body. The skin graft is sutured to the edges of the defect, and a bolster dressing is placed atop the graft for seven to ten days, to immobilize the graft as it heals in ...