Rare hamartomatous lesion in the inframammary region

A 66-year-old woman patient, phototype III, born in So Paulo, Brazil, complained of a lesion that appeared 2 years prior, on the right inframammary region.On examination, there were discreetly erythematous-brown confluent papules forming a plaque with a rough surface, measuring 4 3 8 cm (Fig 1).The personal medical history was positive for osteoporosis, hypothyroidism, and osteoarthritis (currently using levothyroxine at an appropriate dose according to laboratory control).Question 1: What is the diagnosis?