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 are usually localized to the central trunk. The condition can be treated with minocycline.

○ Treatment
#Minocycline
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  • Typical case — It appears as a black pigmented spot around the waist, without symptoms such as itching or pain.
  • Severe form.
  • The waist is a common site.
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.