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Quiz
Skin coloured lumps and bumps – 12 cases

Skin coloured lumps and bumps may be difficult to distinguish one from another. It is helpful to consider body site, location within the skin, size, consistency and morphology. Some common lesions are described here.

First, a reminder about terminology in dermatology.

  • A papule is a small palpable lesion (less than 0.5 cm)
  • A nodule is a larger rounded lesion
  • A plaque is a flat palpable lesion
  • A cyst is fluctuant because it contains fluid or semi-fluid material

For each of the twelve cases, study the image(s) and then answer the questions. You can click on the image to view a larger version if required.

Each case should take approximately 2 minutes to complete. There is a list of suggested further reading material at the end of the quiz.

Case 4

The first is Dermatofibroma

The second is a pinch sign for dermatofibroma

A dermatofibroma, also called benign fibrous histiocytoma, is a firm dermal papule most often located on the lower limbs. Other common sites include thighs, upper arms and shoulders. These lesions are firmly adherent to the skin so that there is a central dimple if compressed between two fingers. Dermatofibromas may be skin coloured, pink or brown, and tend to be paler in the centre. This central pallor is more marked on dermatoscopy. Dermatofibroma often follows an insect bite and is persistent. No treatment is required.

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