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With regard to morphology, the initial lesion that characterizes a condition is known as the "primary lesion", and identification of such a lesions is the most important aspect of the cutaneous examination. [30] Over time, these primary lesions may continue to develop or be modified by regression or trauma, producing "secondary lesions". [1]
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]
Skin ulcers appear as open craters, often round, with layers of skin that have eroded. The skin around the ulcer may be red, swollen, and tender. Patients may feel pain on the skin around the ulcer, and fluid may ooze from the ulcer. In some cases, ulcers can bleed and, rarely, patients experience fever. Ulcers sometimes seem not to heal ...
But if you scratch at the bites, you can develop a secondary skin infection. That can lead to swelling and pus alongside the itchy bites. Thankfully, chigger bites don't cause diseases like tick ...
Secondary yaws typically shows widespread skin lesions that vary in appearance, including "crab yaws" (areas of skin of abnormal color) on the palms of the hands and soles of the feet [12] (named for the crab-like gait they cause people with painful soles to assume [2]). These may show desquamation.
Schematic image comparing a skin fissure to an erosion and an ulcer. The surface of the knuckles of a hand with xeroderma, showing skin cracking (generalized skin fissuring). A skin fissure is a cutaneous condition in which there is a linear-like cleavage of skin, sometimes defined as extending into the dermis. [1] It is smaller than a skin ...
Secondary cutaneous amyloidosis is a skin condition that occurs following PUVA therapy and in benign and malignant cutaneous neoplasms in which deposits of amyloid may be found. [ 1 ] : 522 [ 2 ]
Secondary cutaneous CD30+ large-cell lymphoma is a cutaneous condition that may arise in cases of mycosis fungoides, and in patients with lymphomatoid papulosis. [ 1 ] : 738 See also