11th July 2023

You see a 28-year-old man in the dermatology clinic. He complains of a boggy lump on his scalp

You see a 28-year-old man in the dermatology clinic. He complains of a boggy lump on his scalp (see image below). He has a past medical history of HIV and has previously been treated for syphilis successfully. He was recently treated for tinea capitis but had poor compliance to therapy.

Lump on scalp

What is the most likely diagnosis?

Select the SINGLE most appropriate option from the list below. Select ONE option only.