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Skin Lump

Definition

  • A skin lump or bump covered by normal skin
  • Skin swelling just in one spot (localized) is also included

Causes of Skin Lumps

  • Insect Bites. The most common cause of an itchy bump is a mosquito bite. Other insects can also cause little bumps.
  • Stings. A bee sting can cause a painful bump. The swelling can become quite large.
  • Lymph Nodes. Most common cause of a lump or mass felt under the skin. Commonly found in the neck or groin. Nodes have a boundary or edge and are movable. This is not the case for the swelling seen with insect bites. Lymph nodes become larger with infections.
  • Scalp Hematoma. The most common cause of a lump on the head is a scalp hematoma (goose egg). In a child under 2 years of age the injury may not have been seen.
  • Injuries. New lumps anywhere can be caused by an injury that wasn't observed. A bruise is often present with the swelling.
  • Callus. Broken bones heal with new bone formation. The medical term is callus. The callus feels like a bony knot that is larger than the bone itself. A callus is most commonly felt after a collarbone fracture.
  • Boils. A boil is a skin abscess. It causes a very painful red lump.

Lumps that are a Normal Part of the Body

  • Breast Bud. A small disc-shaped lump felt under the nipple. It indicates the onset of puberty in 7-12 year old girls.
  • External Occipital Protuberance. The bony lump felt at the base of the skull in back.
  • Mastoid Process. The bony lump felt behind each lower ear.
  • Xiphoid Process. A small hard lump felt at the lower end of the sternum (breastbone).

Common Objects Used to Guess the Size

  • Pea or pencil eraser: ¼ inch or 6 mm
  • Dime: ¾ inch or 1.8 cm
  • Quarter: 1 inch or 2.5 cm
  • Golf ball: 1 ½ inches or 3.8 cm
  • Tennis Ball: 2 ½ inches or 6.4 cm

Barton Schmitt MD, FAAP
Disclaimer: this health information is for educational purposes only. You, the reader, assume full responsibility for how you choose to use it.
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