Pityriasis lichenoides chronicahttps://en.wikipedia.org/wiki/Pityriasis_lichenoides_chronica
Pityriasis lichenoides chronica is an uncommon, idiopathic, acquired dermatosis characterized by groups of erythematous, scaly papules that may persist for months. A biopsy is required for diagnosis.

○ Diagnosis and Treatment
• Blood tests to rule out syphilis
• Biopsy to exclude cutaneous lymphoma

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      References Pityriasis lichenoides chronica - Case reports 15748578
      A 19-year-old woman came in with a five-year history of small, spotty rashes and raised, yellowish to skin-colored bumps with a ring of fine scales on her torso and arms and legs. Guttate pityriasis lichenoides chronica is an uncommon presentation of this T-cell-mediated disease.