A lesson in spotting late-diagnosis HIV

Andrew, a 63-year-old retired mechanic, presents with bilateral red, scaly, flaky plaques on his cheeks, eyebrows and nasal bridge.
He presented with similar symptoms six weeks ago and was treated with topical steroids, with no effect.
He has a recent history of 12 months of anorexia, 15kg of unintentional weight loss, fatigue and intermittent diarrhoea and vomiting.
He has been referred to multiple specialist outpatient clinics and investigations for gastrointestinal, thyroid, neoplastic and haematological disease have not revealed a cause.