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Hard lump with a scaly top or ulceration. [ 1] Cutaneous squamous-cell carcinoma ( cSCC ), also known as squamous-cell carcinoma of the skin or squamous-cell skin cancer, is one of the three principal types of skin cancer, alongside basal-cell carcinoma and melanoma. [ 10] cSCC typically presents as a hard lump with a scaly surface, though it ...
Keratoacanthoma ( KA) is a common low-grade (unlikely to metastasize or invade) rapidly-growing skin tumour that is believed to originate from the hair follicle ( pilosebaceous unit) and can resemble squamous cell carcinoma. [ 1][ 2] The defining characteristic of a keratoacanthoma is that it is dome-shaped, symmetrical, surrounded by a smooth ...
Basal-cell carcinoma. Basal-cell carcinoma ( BCC ), also known as basal-cell cancer, basalioma[ 7] or rodent ulcer, [ 8] is the most common type of skin cancer. [ 2] It often appears as a painless raised area of skin, which may be shiny with small blood vessels running over it. [ 1] It may also present as a raised area with ulceration. [ 1]
Merkel cell carcinoma ( MCC) is a rare and aggressive skin cancer occurring in about three people per million members of the population. [ 1] It is also known as cutaneous APUDoma, primary neuroendocrine carcinoma of the skin, primary small cell carcinoma of the skin, and trabecular carcinoma of the skin. [ 2]
The exact cause of erosive pustular dermatitis of the scalp is unknown. Risk factors include actinic damage, epidermal atrophy, topical drugs and agent, surgery, and infections. Trauma and tissue injury are other potential triggers. A skin biopsy can be used to help rule out potential differential diagnoses but histopathology is unspecific.
Pilomatricoma. Histopathology of pilomatricoma, high magnification, H&E stain, showing the characteristic components of basaloid cells and ghost cells. Pilomatricoma is a benign skin tumor derived from the hair matrix. [ 2][ 3] These neoplasms are relatively uncommon and typically occur on the scalp, face, and upper extremities.
Sebaceous carcinoma, also known as sebaceous gland carcinoma (SGc), sebaceous cell carcinoma, and meibomian gland carcinoma is an uncommon malignant cutaneous tumor. [ 1] Most are typically about 1.4 cm at presentation. [ 2] SGc originates from sebaceous glands in the skin and, therefore, may originate anywhere in the body where these glands ...
Dermal cylindroma. In dermatologic pathology, a dermal cylindroma, also dermal eccrine cylindroma or cutaneous cylindroma [1] : 666 ) and (less specifically) cylindroma, is a benign adnexal tumor [2] that occurs on the scalp and forehead. Multiple cylindromas may grow together in a "hat-like" configuration, sometimes referred to as a turban ...