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Cutaneous cryptococcosis:

• Cryptococcus neoformans is an encapsulated yeast
• Occurs in patients with advanced HIV (CD4<100/mm3)
• The most common manifestation is meningoencephalitis
• Pulmonary and/or disseminated disease may occur
• Cutaneous cryptococcosis considered as a marker of disseminated disease
• Rapid onset of multiple widespread papular lesions with central umbilication
• Diagnostic clue is the presence of a small area of central hemorrhage or necrosis
• Resembles molluscum contagiosum
• Most common areas affected are head and neck
• Disseminated infections can affect liver, lymph nodes, peritoneum, adrenal gland, and eyes

DD:

• Kaposi Sarcoma:
  • Primarily presents in homosexual men(men with HIV who are sexually active with other men)
  • Red or purple papules with no necrosis

• Basal cell carcinoma
  • Single, pink, flesh-colored papules
  • Arise slowly

• Disseminated Mycobacterium avium complex:
  • Common opportunistic infection
  • Affects patients with advanced AIDS
  • Presents as fever, night sweats, abdominal pain, diarrhea, weight loss
  • Cutaneous lesions are uncommon and are usually nodular and ulcerating

• Pyoderma gangrenosum:
  • Rare neutrophilic dermatitis
  • Associated with inflammatory bowel disease and inflammatory srthritides
  • Presents as a tender papule that degrades into a bluish, violaceous ulcer