Do you recognise this rash?

An otherwise healthy 50-year-old male presents to his new GP with a rash he’s had for several years.

Rash

He mentions that the skin eruption becomes erythematous and pruritic after exercising and when he scratches it. 

On examination, reddish-brown freckle-like macules are seen on his upper extremities, back and abdomen. 

A skin biopsy reveals an increased number of dermal mast cells. 

Which of the following is most commonly associated with this patient’s likely diagnosis?  

  1. Interstitial lung disease 
  2. Peptic

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