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  2. Pachycephalosaurus - Wikipedia

    en.wikipedia.org/wiki/Pachycephalosaurus

    Pachycephalosaurus (/ ˌ p æ k ɪ ˌ s ɛ f əl ə ˈ s ɔː r ə s /; [2] meaning "thick-headed lizard", from Greek pachys-/ παχύς-"thickness", kephalon/ κεφαλή "head" and sauros/ σαῦρος "lizard") [3] is a genus of pachycephalosaurid ornithischian dinosaur. The type species, P. wyomingensis, is the only known definitive species.

  3. Trichilemmal cyst - Wikipedia

    en.wikipedia.org/wiki/Trichilemmal_cyst

    Relative incidence of cutaneous cysts: Trichilemmal cyst is labeled near top. 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.

  4. Occipital bun - Wikipedia

    en.wikipedia.org/wiki/Occipital_bun

    An occipital bun, also called an occipital spur, occipital knob, chignon hook or inion hook, is a prominent bulge or projection of the occipital bone at the back of the skull.

  5. Cutaneous squamous-cell carcinoma - Wikipedia

    en.wikipedia.org/wiki/Cutaneous_squamous-cell...

    Hard lump with a scaly top or ulceration. [1] Risk factors: Ultraviolet radiation, actinic keratosis, tobacco smoking, lighter skin, arsenic exposure, radiotherapy, poor immune system function, HPV infection [2] Diagnostic method: Tissue biopsy [2] [3] Differential diagnosis: Keratoacanthoma, actinic keratosis, melanoma, warts, basal cell ...

  6. Periapical cyst - Wikipedia

    en.wikipedia.org/wiki/Periapical_cyst

    Periapical cysts begin as asymptomatic and progress slowly. Subsequent infection of the cyst causes swelling and pain. Initially, the cyst swells to a round hard protrusion, but later on the body resorbs some of the cyst wall, leaving a softer accumulation of fluid underneath the mucous membrane. [citation needed]

  7. Sebaceous cyst - Wikipedia

    en.wikipedia.org/wiki/Sebaceous_cyst

    A sebaceous cyst is a term commonly used to refer to either: [1]. Epidermoid cysts (also termed epidermal cysts, infundibular cyst); Pilar cysts (also termed trichelemmal cysts, isthmus-catagen cysts)

  8. Skin cancer - Wikipedia

    en.wikipedia.org/wiki/Skin_cancer

    It usually presents as a hard lump with a scaly top but may also form an ulcer. [2] Melanomas are the most aggressive. Signs include a mole that has changed in size, shape, color, has irregular edges, has more than one color, is itchy or bleeds. [3] More than 90% of cases are caused by exposure to ultraviolet radiation from the Sun. [4]

  9. Pachycephalosauria - Wikipedia

    en.wikipedia.org/wiki/Pachycephalosauria

    Pachycephalosaurs were bipedal ornithischians characterized by their thickened skulls. They had a bulky torso with an expanded gut cavity and broad hips, short forelimbs, long legs, a short, thick neck, and a heavy tail.

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