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A trichilemmal cyst (or pilar cyst) is a common cyst that forms from a hair follicle, most often on the scalp, and is smooth, mobile, and filled with keratin, a protein component found in hair, nails, skin, and horns. Trichilemmal cysts are clinically and histologically distinct from trichilemmal horns, hard tissue that is much rarer and not ...
Cutis verticis gyrata is a medical condition usually associated with thickening of the scalp. [ 1] The condition is identified by excessive thickening of the soft tissues of the scalp and characterized by ridges and furrows, which give the scalp a cerebriform appearance. Clinically, the ridges are hard and cannot be flattened on applying pressure.
Sebaceous cyst. A sebaceous cyst is a term commonly used to refer to either: [ 1] Both of the above types of cysts contain keratin, not sebum, and neither originates from sebaceous glands. Epidermoid cysts originate in the epidermis and pilar cysts originate from hair follicles. Technically speaking, then, they are not sebaceous cysts. [ 2] ".
Cutaneous horn. Actinic keratosis, pre-cancerous area of thick, scaly, or crusty skin (Below) with cutaneous horn tissue (above) Cutaneous horns, also known by the Latin name cornu cutaneum, are unusual keratinous skin tumors with the appearance of horns, or sometimes of wood or coral. Formally, this is a clinical diagnosis for a "conical ...
Phrenology or craniology (from Ancient Greek φρήν (phrēn) 'mind' and λόγος ( logos) 'knowledge') is a pseudoscience that involves the measurement of bumps on the skull to predict mental traits. [ 1][ 2] It is based on the concept that the brain is the organ of the mind, and that certain brain areas have localized, specific functions ...
Common [ 1] Pearly penile papules (PPP; also known as hirsutoid papillomas or as papillae coronae glandis, [ 4] Latin for 'papillae of the corona of the glans') are benign, small bumps or spots on the human penis. [ 2][ 3] They vary in size from 1–4 mm, are pearly or flesh-colored, smooth and dome-topped or filiform, and appear in one or ...
A lipoma is a benign tumor made of fat tissue. [1] They are generally soft to the touch, movable, and painless. [1] They usually occur just under the skin, but occasionally may be deeper. [1] Most are less than 5 cm (2.0 in) in size. [2] Common locations include upper back, shoulders, and abdomen. [4]
Commonly known as a dental cyst, the periapical cyst is the most common odontogenic cyst. It may develop rapidly from a periapical granuloma, as a consequence of untreated chronic periapical periodontitis. [ 1] Periapical is defined as "the tissues surrounding the apex of the root of a tooth " and a cyst is "a pathological cavity lined by ...