Discoid eczema vs tinea corporis

Discoid eczema

Discriminatory signs

  •  Also known as nummular dermatitis.
  • Pink, red or brown and well defined.
  • Dry cracked, bumpy, blistered or crusted surface.
  • May be itchy or asymptomatic.
  • Most common in middle age, but any age can be affected.
  • Not infectious.
  • Can become secondarily infected by bacteria.
  • Start off from insect bite or scratch.
  • Up to a dozen patches may appear.
  • Waxes and wanes, and persists for weeks or months.
  • Round or oval patches.
  • Variable in size, from several cm to 2mm.
  • Mainly on lower leg.

Management

  • Protect the skin from injury and irritation.
  • Emollients and potent topical steroids.
  • Oral or topical antibiotics if infected.
  • Oral antihistamines if itchy.
  • Short-term systemic steroids are rarely required.
  • On resolution the skin can be normal, dark brown or pale.

Tinea corporis

Discriminatory signs

  • Itchy macule with red scaly edge.
  • Ring shaped, round or oval.
  • Less red and scaly or healed in the middle.
  • Common among children, affects all ages.
  • Contagious by contact.
  • Can be spread by infected cats.
  • Affects arms, legs, face or other exposed body areas.

Management

  • Topical antifungal creams.
  • Infected pets should be treated.

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