Confluent reticulated papillomatosishttps://en.wikipedia.org/wiki/Confluent_and_reticulated_papillomatosis
Confluent reticulated papillomatosis is an uncommon but distinctive acquired ichthyosiform dermatosis characterized by persistent dark, scaly, patches that tend to be localized predominantly on the central trunk. The disease can be treated by Minocycline.

○ Treatment
#Minocycline
  • Typical case ― It appears as a black pigmented spot with no symptoms (itching, pain) around the waist.
  • Severe form
  • The waist is a common location.
References Confluent and Reticulated Papillomatosis 29083642 
NIH
Confluent and reticulated papillomatosis (CRP), also known as Gougerot-Carteaud syndrome, is caused by disordered keratinization. It presents with asymptomatic hyperpigmented papules that can coalesce into plaques and are typically located on the upper trunk and neck of teens and young adults. First-line treatment is oral 'minocycline'.
 Confluent and reticulated papillomatosis: diagnostic and treatment challenges 27601929 
NIH
CRP typically presents as asymptomatic hyperpigmented papules and plaques with peripheral reticulation over the nape, axillae, upper chest, and upper back, occasionally with extension superior to the forehead and inferior to the pubic region. Antibiotics, such as 'minocycline', at anti-inflammatory doses have emerged as a preferred therapeutic option.